diff --git a/internal/service/media.go b/internal/service/media.go
index 551eb4e..33eb291 100644
--- a/internal/service/media.go
+++ b/internal/service/media.go
@@ -198,8 +198,10 @@ func (s *MediaService) SearchMedia(ctx context.Context, query string, limit int)
 }
 
 func (s *MediaService) SearchMediaVisible(ctx context.Context, query string, limit int, visibility MediaVisibility) ([]model.Media, error) {
-	if limit <= 0 || limit > 200 {
+	if limit <= 0 {
 		limit = 50
+	} else if limit > 2000 {
+		limit = 2000
 	}
 	return s.repo.Media.SearchFiltered(ctx, query, limit, repository.MediaQueryFilter{
 		IncludeNSFW:       visibility.IncludeNSFW,
diff --git a/internal/service/media_visibility_test.go b/internal/service/media_visibility_test.go
index 4981d47..f97b571 100644
--- a/internal/service/media_visibility_test.go
+++ b/internal/service/media_visibility_test.go
@@ -1,6 +1,7 @@
 package service
 
 import (
+	"fmt"
 	"slices"
 	"testing"
 
@@ -140,6 +141,41 @@ func TestConfiguredAdultLibrariesDoNotHideSafeLibraryWithNSFWItems(t *testing.T)
 	}
 }
 
+func TestSearchMediaVisibleHonorsLargePosterWallLimit(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	lib := model.Library{Name: "海报墙", Path: "/media/all", Type: "tv", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatal(err)
+	}
+	rows := make([]model.Media, 260)
+	for i := range rows {
+		rows[i] = model.Media{
+			LibraryID: lib.ID,
+			Title:     fmt.Sprintf("节目 %03d", i),
+			Path:      fmt.Sprintf("/media/all/show-%03d.mkv", i),
+		}
+	}
+	if err := db.Create(&rows).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	items, err := NewMediaService(&config.Config{}, zap.NewNop(), repos).
+		SearchMediaVisible(t.Context(), "", 240, MediaVisibility{IncludeNSFW: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) != 240 {
+		t.Fatalf("large poster wall search returned %d rows, want 240", len(items))
+	}
+}
+
 func sortedMediaTitles(rows []model.Media) []string {
 	out := make([]string, 0, len(rows))
 	for _, row := range rows {
diff --git a/web/src/pages/PosterWallPage.tsx b/web/src/pages/PosterWallPage.tsx
index e32094c..2f47a98 100644
--- a/web/src/pages/PosterWallPage.tsx
+++ b/web/src/pages/PosterWallPage.tsx
@@ -1,24 +1,55 @@
 import { useEffect, useMemo, useState } from 'react'
 import { GalleryHorizontalEnd, Layers } from 'lucide-react'
 
-import { mediaAPI } from '../api/library'
+import { libraryAPI } from '../api/library'
 import { MediaCard } from '../components/MediaCard'
 import { groupSeries } from '../utils/groupSeries'
 import type { Media } from '../types'
 
+const POSTER_WALL_PAGE_SIZE = 2000
+
 // PosterWallPage 把所有媒体的代表海报聚合到同一面墙，便于一目了然
 // 浏览整个站点的内容。所有 episode 行会按剧集折叠，避免同一海报刷屏。
 export function PosterWallPage() {
   const [items, setItems] = useState<Media[]>([])
   const [loading, setLoading] = useState(true)
+  const [error, setError] = useState('')
 
   useEffect(() => {
-    // 拉得多一点（500），折叠后才能凑够展示量；后端 page_size 上限可能
-    // 需要后续观察，暂以 500 试探。
-    mediaAPI
-      .search('', 500)
-      .then((d) => setItems(d.items))
-      .finally(() => setLoading(false))
+    let cancelled = false
+    async function loadPosterWall() {
+      setLoading(true)
+      setError('')
+      try {
+        const libraries = await libraryAPI.list()
+        const all = (
+          await Promise.all(
+            libraries.map(async (library) => {
+              const rows: Media[] = []
+              let page = 1
+              for (;;) {
+                const data = await libraryAPI.listMedia(library.id, page, POSTER_WALL_PAGE_SIZE)
+                rows.push(...(data.items || []))
+                if (rows.length >= data.total || data.items.length === 0) break
+                page += 1
+              }
+              return rows
+            }),
+          )
+        ).flat()
+        if (!cancelled) setItems(all)
+      } catch (err) {
+        if (!cancelled) {
+          setError((err as { response?: { data?: { error?: string } } })?.response?.data?.error ?? '海报墙加载失败')
+        }
+      } finally {
+        if (!cancelled) setLoading(false)
+      }
+    }
+    loadPosterWall()
+    return () => {
+      cancelled = true
+    }
   }, [])
 
   const cards = useMemo(() => groupSeries(items).slice(0, 240), [items])
@@ -36,7 +67,12 @@ export function PosterWallPage() {
       </header>
 
       {loading && <p className="text-sand-500">加载中…</p>}
-      {!loading && cards.length === 0 && (
+      {!loading && error && (
+        <p className="rounded-2xl border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">
+          {error}
+        </p>
+      )}
+      {!loading && !error && cards.length === 0 && (
         <p className="text-ink-50">暂无媒体。请先添加媒体库并扫描。</p>
       )}
       <div className="grid grid-cols-3 gap-3 sm:grid-cols-4 md:grid-cols-6 lg:grid-cols-8 xl:grid-cols-10">