diff --git a/src/pages/battle-room.vue b/src/pages/battle-room.vue
index 37f0433..1bf2695 100644
--- a/src/pages/battle-room.vue
+++ b/src/pages/battle-room.vue
@@ -267,17 +267,17 @@ const shareTitle = computed(() => {
 
 /**
  * 根据对战类型和靶纸尺寸动态返回分享封面图路径，共 4 张图：
- *   contest_share_20.jpg — 约战/对抗赛 + 20cm 靶
- *   contest_share_40.jpg — 约战/对抗赛 + 40cm 靶
- *   melee_share_20.jpg   — 多人乱斗 + 20cm 靶
- *   melee_share_40.jpg   — 多人乱斗 + 40cm 靶
+ *   contest_share_20.png — 约战/对抗赛 + 20cm 靶
+ *   contest_share_40.png — 约战/对抗赛 + 40cm 靶
+ *   melee_share_20.png   — 多人乱斗 + 20cm 靶
+ *   melee_share_40.png   — 多人乱斗 + 40cm 靶
  *
  * 当 targetSize 未知时默认取 20cm 图。
  */
 const shareImage = computed(() => {
   const type = room.value.battleType === 2 ? 'melee' : 'contest';
   const size = targetSize.value === 40 ? '40' : '20';
-  return `https://static.shelingxingqiu.com/shootmini/static/share/${type}_share_${size}.jpg`;
+  return `https://static.shelingxingqiu.com/shootmini/static/share/${type}_share_${size}.png`;
 });
 
 onShareAppMessage(() => {