diff --git a/frontend/src/pages/admin/AdminTasksPage.tsx b/frontend/src/pages/admin/AdminTasksPage.tsx
index d7d5a92..935193d 100644
--- a/frontend/src/pages/admin/AdminTasksPage.tsx
+++ b/frontend/src/pages/admin/AdminTasksPage.tsx
@@ -237,6 +237,14 @@ export default function AdminTasksPage() {
     loadProducts(keyword);
   }
 
+  // 🚀 二维码弹窗打开时锁定背景滚动（防止滚动穿透）
+  useEffect(() => {
+    if (!qrSerial) return;
+    const prev = document.body.style.overflow;
+    document.body.style.overflow = "hidden";
+    return () => { document.body.style.overflow = prev; };
+  }, [qrSerial]);
+
   // ---- 按订单/设备分组 + 状态过滤 + 列筛选 + 组内排序 ----
   const orderGroups = useMemo<OrderGroup[]>(() => {
     const map = new Map<string, ProductResponse[]>();