diff --git a/kernel/api/riff.go b/kernel/api/riff.go
index df706cd54..a141c4d0e 100644
--- a/kernel/api/riff.go
+++ b/kernel/api/riff.go
@@ -126,7 +126,6 @@ func getRiffDueCards(c *gin.Context) {
 	ret.Data = cards
 }
 
-// TODO 删除闪卡
 func removeRiffCards(c *gin.Context) {
 	ret := gulu.Ret.NewResult()
 	defer c.JSON(http.StatusOK, ret)
diff --git a/kernel/model/flashcard.go b/kernel/model/flashcard.go
index 719812084..fb24dedbb 100644
--- a/kernel/model/flashcard.go
+++ b/kernel/model/flashcard.go
@@ -602,6 +602,12 @@ func AddFlashcards(deckID string, blockIDs []string) (err error) {
 	}
 
 	for _, blockID := range blockIDs {
+		cards := deck.GetCardsByBlockID(blockID)
+		if 0 < len(cards) {
+			// 一个块只能添加生成一张闪卡 https://github.com/siyuan-note/siyuan/issues/7476
+			continue
+		}
+
 		cardID := ast.NewNodeID()
 		deck.AddCard(cardID, blockID)
 	}