diff --git a/web/src/pages/Shelf.tsx b/web/src/pages/Shelf.tsx
index 69280cc..4f28fa7 100644
--- a/web/src/pages/Shelf.tsx
+++ b/web/src/pages/Shelf.tsx
@@ -60,6 +60,7 @@ function BookCard({
 export default function Shelf() {
   const qc = useQueryClient();
   const nav = useNavigate();
+  const { isAdmin } = useAuth();
   const [lib, setLib] = useState(0); // 0 = 全部库
   const [qRaw, setQRaw] = useState("");
   const [q, setQ] = useState("");
@@ -113,7 +114,7 @@ export default function Shelf() {
             <button className={btn} onClick={() => qc.invalidateQueries({ queryKey: ["books"] })}>
               刷新
             </button>
-            {lib > 0 && (
+            {isAdmin && lib > 0 && (
               <button className={btn} disabled={scan.isPending} onClick={() => scan.mutate(lib)}>
                 {scan.isPending ? "扫描中…" : "扫描此库"}
               </button>