An audio playback method used in an audio playback device is provided. The audio playback method includes steps outlined below. An audio playback command is received by a processing unit through a network communication unit. A total sound channel number of the audio playback device is determined by the processing unit. A piece of audio data having a specific sound channel number is retrieved by the processing unit through the network communication unit from internet, wherein the specific sound channel number is equal to or larger than the total sound channel number. Audio playback modules are controlled to play an audio by the processing unit according to the audio data.