diff --git a/src/main/java/com/cabin/plat/domain/playlist/service/PlaylistServiceImpl.java b/src/main/java/com/cabin/plat/domain/playlist/service/PlaylistServiceImpl.java
index 4e86e1a..ac657a8 100644
--- a/src/main/java/com/cabin/plat/domain/playlist/service/PlaylistServiceImpl.java
+++ b/src/main/java/com/cabin/plat/domain/playlist/service/PlaylistServiceImpl.java
@@ -134,13 +134,19 @@ public PlaylistResponse.PlayListId addTrackToPlaylist(Member member, Long playli
             throw new RestApiException(PlaylistErrorCode.PLAYLIST_UPDATE_FORBIDDEN);
         }
 
-        // TODO: playlist.getPlaylistTracks 를 가져와서 orderIndex 계산
+        // TODO: playlist.getPlaylistTracks 로 가져오기 (현재는 playlistTrackRepository.findAllByPlaylistIs(playlist) 로 대체)
         List<PlaylistTrack> playlistTracks = playlistTrackRepository.findAllByPlaylistIs(playlist);
+
+        if (playlistTracks.stream().anyMatch(playlistTrack -> playlistTrack.getTrack().getId().equals(trackId.getTrackId()))) {
+            throw new RestApiException(PlaylistErrorCode.PLAYLIST_TRACK_DUPLICATE);
+        }
+
         int nextOrderIndex = playlistTracks.isEmpty() ? 0 : playlistTracks.stream()
                 .mapToInt(PlaylistTrack::getOrderIndex)
                 .max()
                 .orElse(0) + 1;
 
+
         PlaylistTrack playlistTrack = playlistMapper.toPlaylistTrack(playlist, track, nextOrderIndex);
         playlistTrackRepository.save(playlistTrack);
         return playlistMapper.toPlaylistId(playlistId);
diff --git a/src/main/java/com/cabin/plat/global/exception/errorCode/PlaylistErrorCode.java b/src/main/java/com/cabin/plat/global/exception/errorCode/PlaylistErrorCode.java
index 6acf06d..94aa238 100644
--- a/src/main/java/com/cabin/plat/global/exception/errorCode/PlaylistErrorCode.java
+++ b/src/main/java/com/cabin/plat/global/exception/errorCode/PlaylistErrorCode.java
@@ -12,6 +12,7 @@ public enum PlaylistErrorCode implements ErrorCodeInterface{
     PLAYLIST_UPDATE_FORBIDDEN("PLAYLIST003", "이 플레이리스트를 업데이트할 권한이 없습니다.", HttpStatus.FORBIDDEN),
     PLAYLIST_TRACK_NOT_FOUND("PLAYLIST004", "플레이리스트에 해당 트랙이 존재하지 않습니다.", HttpStatus.NOT_FOUND),
     PLAYLIST_TRACK_DELETE_FORBIDDEN("PLAYLIST005", "이 플레이리스트의 트랙을 삭제할 권한이 없습니다.", HttpStatus.FORBIDDEN),
+    PLAYLIST_TRACK_DUPLICATE("PLAYLIST006", "이미 추가된 트랙입니다.", HttpStatus.BAD_REQUEST),
     ;
 
     private final String code;