diff --git a/sundynix-desktop/frontend/src/App.tsx b/sundynix-desktop/frontend/src/App.tsx
index c661413..412ca9d 100644
--- a/sundynix-desktop/frontend/src/App.tsx
+++ b/sundynix-desktop/frontend/src/App.tsx
@@ -139,6 +139,16 @@ export default function App() {
     },
     [refreshTenant],
   );
+  // 启用全员空间（整租户共享；幂等纳入全部成员）——须租户 admin。
+  const onEnableTenantSpace = useCallback(async () => {
+    try {
+      const { id } = await createSpace("全员空间", "tenant");
+      await switchSpace(id);
+      refreshTenant();
+    } catch (e) {
+      window.alert((e as Error).message);
+    }
+  }, [refreshTenant]);
   useEffect(() => {
     if (!user) {
       setTenant(null);
@@ -288,7 +298,7 @@ export default function App() {
         style={{ background: "radial-gradient(60% 100% at 50% 0%, rgba(124,92,246,0.10), transparent 70%)" }}
       />
       <UpdateBanner />
-      <TopBar user={user} tenant={tenant} tenants={tenants} onSwitchTenant={onSwitchTenant} space={space} spaces={spaces} onSwitchSpace={onSwitchSpace} onCreateSpace={onCreateSpace} onLogout={onLogout} onCommand={() => setCmdOpen(true)} onOpenUsage={() => setView("usage")} />
+      <TopBar user={user} tenant={tenant} tenants={tenants} onSwitchTenant={onSwitchTenant} space={space} spaces={spaces} onSwitchSpace={onSwitchSpace} onCreateSpace={onCreateSpace} onEnableTenantSpace={onEnableTenantSpace} tenantRole={tenant?.role ?? ""} onLogout={onLogout} onCommand={() => setCmdOpen(true)} onOpenUsage={() => setView("usage")} />
       <ApprovalBar run={run} />
       <div className="relative flex min-h-0 flex-1">
         <LeftNav active={view} onSelect={setView} />
diff --git a/sundynix-desktop/frontend/src/shell/TopBar.tsx b/sundynix-desktop/frontend/src/shell/TopBar.tsx
index 486c619..9019443 100644
--- a/sundynix-desktop/frontend/src/shell/TopBar.tsx
+++ b/sundynix-desktop/frontend/src/shell/TopBar.tsx
@@ -1,5 +1,5 @@
 import type { CSSProperties } from "react";
-import { User, ChevronDown, Search as SearchIcon, LogOut, Sun, Moon, Coins, Building2, Users as UsersIcon, Plus } from "lucide-react";
+import { User, ChevronDown, Search as SearchIcon, LogOut, Sun, Moon, Coins, Building2, Users as UsersIcon, Plus, Globe } from "lucide-react";
 import type { AuthUser, TenantCtx, MyTenant, SpaceCtx, MySpace } from "../lib/api";
 import { useHealth } from "../lib/health";
 import { isMacDesktop } from "../lib/desktop";
@@ -67,9 +67,11 @@ function TenantSwitcher({ tenants, activeId, onSwitch }: { tenants: MyTenant[];
 
 // 工作区切换器：切换活跃 Space（共享工作区 — 个人/项目/全员）。含"新建项目空间"。
 // 个人空间恒有，故 ≥1 即显示（让用户随时能建/进项目协作空间）。
-function SpaceSwitcher({ spaces, activeId, onSwitch, onCreate }: { spaces: MySpace[]; activeId?: string; onSwitch?: (id: string) => void; onCreate?: (name: string) => void }) {
+function SpaceSwitcher({ spaces, activeId, onSwitch, onCreate, onEnableTenantSpace, tenantRole }: { spaces: MySpace[]; activeId?: string; onSwitch?: (id: string) => void; onCreate?: (name: string) => void; onEnableTenantSpace?: () => void; tenantRole?: string }) {
   if (spaces.length === 0) return null;
   const label = (s: MySpace) => (s.kind === "personal" ? "个人空间" : s.name) + (s.kind !== "personal" ? ` · ${s.members}人` : "");
+  const canManage = tenantRole === "owner" || tenantRole === "admin";
+  const hasTenantSpace = spaces.some((s) => s.kind === "tenant");
   return (
     <div className="flex items-center gap-1" style={NODRAG}>
       <div className="relative">
@@ -98,12 +100,23 @@ function SpaceSwitcher({ spaces, activeId, onSwitch, onCreate }: { spaces: MySpa
       >
         <Plus className="h-3.5 w-3.5" />
       </button>
+      {canManage && !hasTenantSpace && (
+        <button
+          onClick={() => {
+            if (window.confirm("启用「全员空间」？将把本租户全部成员纳入一个共享工作区（整租户共享编排/知识库）。")) onEnableTenantSpace?.();
+          }}
+          title="启用全员空间（整租户共享，自动纳入所有成员）"
+          className="flex items-center rounded-md border border-line bg-ink-800 px-1.5 py-1 text-slate-400 transition hover:border-ink-600 hover:text-slate-200"
+        >
+          <Globe className="h-3.5 w-3.5" />
+        </button>
+      )}
     </div>
   );
 }
 
 // 顶栏：品牌 · 垂直切换 · 健康灯 · 租户/工作区切换 · 积分余额 · 登录用户 + 登出（深色 + 毛玻璃）。
-export function TopBar({ user, tenant, tenants = [], onSwitchTenant, space, spaces = [], onSwitchSpace, onCreateSpace, onLogout, onCommand, onOpenUsage }: { user: AuthUser; tenant?: TenantCtx | null; tenants?: MyTenant[]; onSwitchTenant?: (id: string) => void; space?: SpaceCtx | null; spaces?: MySpace[]; onSwitchSpace?: (id: string) => void; onCreateSpace?: (name: string) => void; onLogout: () => void; onCommand?: () => void; onOpenUsage?: () => void }) {
+export function TopBar({ user, tenant, tenants = [], onSwitchTenant, space, spaces = [], onSwitchSpace, onCreateSpace, onEnableTenantSpace, tenantRole, onLogout, onCommand, onOpenUsage }: { user: AuthUser; tenant?: TenantCtx | null; tenants?: MyTenant[]; onSwitchTenant?: (id: string) => void; space?: SpaceCtx | null; spaces?: MySpace[]; onSwitchSpace?: (id: string) => void; onCreateSpace?: (name: string) => void; onEnableTenantSpace?: () => void; tenantRole?: string; onLogout: () => void; onCommand?: () => void; onOpenUsage?: () => void }) {
   const h = useHealth();
   const { theme, toggle } = useTheme();
   return (
@@ -147,7 +160,7 @@ export function TopBar({ user, tenant, tenants = [], onSwitchTenant, space, spac
       </div>
       <div className="ml-auto flex items-center gap-2" style={NODRAG}>
         <TenantSwitcher tenants={tenants} activeId={tenant?.tenant?.id} onSwitch={onSwitchTenant} />
-        <SpaceSwitcher spaces={spaces} activeId={space?.space?.id} onSwitch={onSwitchSpace} onCreate={onCreateSpace} />
+        <SpaceSwitcher spaces={spaces} activeId={space?.space?.id} onSwitch={onSwitchSpace} onCreate={onCreateSpace} onEnableTenantSpace={onEnableTenantSpace} tenantRole={tenantRole} />
         {tenant?.tenant && <CreditChip tenant={tenant} onClick={onOpenUsage} />}
         <button
           onClick={toggle}
diff --git a/sundynix-gateway/internal/handler/space.go b/sundynix-gateway/internal/handler/space.go
index bf5a177..69ed805 100644
--- a/sundynix-gateway/internal/handler/space.go
+++ b/sundynix-gateway/internal/handler/space.go
@@ -57,20 +57,32 @@ func (h *Handler) SpaceCurrent(c *gin.Context) {
 
 // SpaceCreate: POST /api/v1/spaces {name, kind} —— 在活跃租户建一个工作区（建者成为 owner）。
 // 已由 RequireTenantRole(member) 门控：租户只读 viewer 进不来。
+// kind=tenant（全员空间）走 EnableTenantSpace（幂等纳入全部成员），且须租户 admin。
 func (h *Handler) SpaceCreate(c *gin.Context) {
 	var b struct {
 		Name string `json:"name"`
 		Kind string `json:"kind"`
 	}
-	if err := c.ShouldBindJSON(&b); err != nil || strings.TrimSpace(b.Name) == "" {
+	_ = c.ShouldBindJSON(&b)
+	if b.Kind == store.SpaceKindTenant {
+		// 启用全员空间：整租户级动作，须租户 admin/owner。
+		if store.RoleRank(h.db.MemberRole(c.Request.Context(), tenantID(c), userID(c))) < store.RoleRank(store.RoleAdmin) {
+			c.JSON(http.StatusForbidden, gin.H{"error": "启用全员空间需要租户管理员权限"})
+			return
+		}
+		s, err := h.db.EnableTenantSpace(c.Request.Context(), tenantID(c))
+		if err != nil {
+			c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"id": s.ID, "name": s.Name, "kind": s.Kind})
+		return
+	}
+	if strings.TrimSpace(b.Name) == "" {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "name 必填"})
 		return
 	}
-	kind := b.Kind
-	if kind != store.SpaceKindProject && kind != store.SpaceKindTenant {
-		kind = store.SpaceKindProject // 只允许经此建 project/tenant；personal 由系统建
-	}
-	s, err := h.db.CreateSpace(c.Request.Context(), tenantID(c), b.Name, kind, userID(c))
+	s, err := h.db.CreateSpace(c.Request.Context(), tenantID(c), b.Name, store.SpaceKindProject, userID(c))
 	if err != nil {
 		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
 		return
diff --git a/sundynix-gateway/internal/store/space.go b/sundynix-gateway/internal/store/space.go
index e78e240..8cf887e 100644
--- a/sundynix-gateway/internal/store/space.go
+++ b/sundynix-gateway/internal/store/space.go
@@ -207,6 +207,70 @@ func (p *Postgres) CreateSpace(ctx context.Context, tenantID, name, kind, creato
 	return s, nil
 }
 
+// ---- 全员空间（tenant-kind：整租户共享，自动纳入全部成员）----
+
+// tenantSpaceID 返回某租户的全员空间 id（无则空 = 未启用）。
+func (p *Postgres) tenantSpaceID(ctx context.Context, tenantID string) string {
+	var s Space
+	if err := p.db.WithContext(ctx).Select("id").
+		Where("tenant_id = ? AND kind = ? AND deleted_at IS NULL AND archived = false", tenantID, SpaceKindTenant).
+		Order("created_at asc").First(&s).Error; err != nil {
+		return ""
+	}
+	return s.ID
+}
+
+// spaceRoleFromTenant 把租户角色映射为空间角色：billing_admin(财务只读)→viewer，其余照搬。
+func spaceRoleFromTenant(role string) string {
+	if role == RoleBillingAdmin {
+		return RoleViewer
+	}
+	return role
+}
+
+// EnableTenantSpace 幂等启用某租户的全员空间：已启用则返回；否则建 kind=tenant 空间 +
+// 把当前全部 active 租户成员按其租户角色纳入（owner→owner…billing_admin→viewer）。
+// 新加入租户的成员由 AddMemberByEmail 自动补纳（见其实现）。
+func (p *Postgres) EnableTenantSpace(ctx context.Context, tenantID string) (*Space, error) {
+	if p.db == nil {
+		return nil, errStoreDisabled
+	}
+	if id := p.tenantSpaceID(ctx, tenantID); id != "" {
+		return p.GetSpace(ctx, id)
+	}
+	members, err := p.ListMembers(ctx, tenantID)
+	if err != nil {
+		return nil, err
+	}
+	creator := ""
+	for _, m := range members {
+		if m.Role == RoleOwner {
+			creator = m.UserID
+			break
+		}
+	}
+	s := &Space{TenantID: tenantID, Name: "全员空间", Kind: SpaceKindTenant, Creator: creator}
+	if err := p.db.WithContext(ctx).Create(s).Error; err != nil {
+		return nil, err
+	}
+	for _, m := range members {
+		if m.Status != "active" {
+			continue
+		}
+		if err := p.addSpaceMember(ctx, s.ID, m.UserID, spaceRoleFromTenant(m.Role)); err != nil {
+			return nil, err
+		}
+	}
+	return s, nil
+}
+
+// autoJoinTenantSpace 若某租户已启用全员空间，把用户按其租户角色纳入（AddMemberByEmail 调用）。
+func (p *Postgres) autoJoinTenantSpace(ctx context.Context, tenantID, userID, tenantRole string) {
+	if sid := p.tenantSpaceID(ctx, tenantID); sid != "" {
+		_ = p.addSpaceMember(ctx, sid, userID, spaceRoleFromTenant(tenantRole))
+	}
+}
+
 // ArchiveSpace 归档空间（软；个人空间不可归档）。
 func (p *Postgres) ArchiveSpace(ctx context.Context, spaceID string) error {
 	if p.db == nil {
diff --git a/sundynix-gateway/internal/store/tenant.go b/sundynix-gateway/internal/store/tenant.go
index 749b4c3..6abe74d 100644
--- a/sundynix-gateway/internal/store/tenant.go
+++ b/sundynix-gateway/internal/store/tenant.go
@@ -241,6 +241,8 @@ func (p *Postgres) AddMemberByEmail(ctx context.Context, tenantID, email, role s
 	}).Create(&TenantMember{TenantID: tenantID, UserID: u.ID, Role: role, Status: "active"}).Error; err != nil {
 		return nil, err
 	}
+	// 若该租户已启用全员空间，新成员自动纳入（全员空间的语义：全租户成员皆在内）。
+	p.autoJoinTenantSpace(ctx, tenantID, u.ID, role)
 	return &MemberInfo{UserID: u.ID, Email: u.Email, Name: u.Name, Role: role, Status: "active"}, nil
 }