The invention discloses an audio data file playback processing method mixed with multiple encoded formats. The method comprises the following steps of: reading content coded format information from a pair of files; setting the decoding parameters of the audio data; and decoding the audio data of different formats to form the data of uniform format according to the decoding parameters and mixing the data to form a playable audio stream; and then controlling the playback process arbitrarily by controlling the external message. By the method, the aim of unified playback can be fulfilled under the condition that the encoded formats of audio data are not unified.