diff --git a/frontend/src/pages/admin/AdminTasksPage.tsx b/frontend/src/pages/admin/AdminTasksPage.tsx
index f5c9f1b..961aa33 100644
--- a/frontend/src/pages/admin/AdminTasksPage.tsx
+++ b/frontend/src/pages/admin/AdminTasksPage.tsx
@@ -39,7 +39,7 @@ export default function AdminTasksPage() {
   // 搜索 & 筛选
   const [keyword, setKeyword] = useState("");
   const [statusFilter, setStatusFilter] = useState("");
-  const [groupBy, setGroupBy] = useState<"order" | "device">("order"); // 🔧 分组维度
+  const [groupBy, setGroupBy] = useState<"order" | "device">("device");
   const [products, setProducts] = useState<ProductResponse[]>([]);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
@@ -76,7 +76,6 @@ export default function AdminTasksPage() {
 
   function handleSearch(e?: React.FormEvent) {
     e?.preventDefault();
-    setExpandedOrders(new Set());
     setExpandedProducts(new Set());
     setTaskTrees({});
     loadProducts(keyword);
@@ -107,6 +106,11 @@ export default function AdminTasksPage() {
       }));
   }, [products, statusFilter, groupBy]);
 
+  // 🔧 默认全部展开
+  useEffect(() => {
+    setExpandedOrders(new Set(orderGroups.map(g => g.orderNo)));
+  }, [orderGroups]);
+
   // ---- 手风琴切换 ----
   function toggleOrder(orderNo: string) {
     setExpandedOrders((prev) => {
@@ -231,14 +235,22 @@ export default function AdminTasksPage() {
 
       {/* ---- 搜索 + 筛选 ---- */}
       <div className="mb-6 rounded-xl bg-white p-4 shadow-sm">
-        <div className="mb-3 flex items-center gap-2">
-          <span className="text-xs text-gray-400">分组:</span>
-          {(["order", "device"] as const).map(m => (
-            <button key={m} onClick={() => setGroupBy(m)}
-              className={`rounded-full px-3 py-1 text-xs font-medium transition-colors ${groupBy === m ? "bg-blue-600 text-white" : "bg-gray-100 text-gray-500 hover:bg-gray-200"}`}>
-              {m === "order" ? "按订单" : "按设备"}
-            </button>
-          ))}
+        <div className="mb-3 flex items-center justify-between">
+          <div className="flex items-center gap-2">
+            <span className="text-xs text-gray-400">分组:</span>
+            {(["order", "device"] as const).map(m => (
+              <button key={m} onClick={() => setGroupBy(m)}
+                className={`rounded-full px-3 py-1 text-xs font-medium transition-colors ${groupBy === m ? "bg-blue-600 text-white" : "bg-gray-100 text-gray-500 hover:bg-gray-200"}`}>
+                {m === "order" ? "按订单" : "按设备"}
+              </button>
+            ))}
+          </div>
+          <div className="flex gap-1">
+            <button onClick={() => setExpandedOrders(new Set(orderGroups.map(g => g.orderNo)))}
+              className="rounded px-2 py-1 text-[11px] text-blue-600 hover:bg-blue-50">全部展开</button>
+            <button onClick={() => setExpandedOrders(new Set())}
+              className="rounded px-2 py-1 text-[11px] text-gray-400 hover:bg-gray-100">全部折叠</button>
+          </div>
         </div>
         <form onSubmit={handleSearch} className="flex items-center gap-2">
           <div className="relative flex-1 max-w-xl">