A method and a device are provided for playing a multimedia file. The device sends a first audio data packet to an audio player device and sends a first video data packet to a video player device. The first audio data packet and the first video data packet both include a data test identifier. The device receives a first timestamp from the audio player device. The device receives a second timestamp from the video player device. The device then sends a second audio data packet and a second video data packet respectively to the audio player device and the video player device according to the first timestamp and the second timestamp. Thus, the audio player device and the video player device play synchronously the second audio data packet and the second video data packet.