The embodiment of the invention discloses a wireless headphone and an audio playing method thereof. A master headphone receives audio data transmitted by audio equipment through a wireless communication module and then sends the encoded audio data to a slave headphone through NFMI, so that the audio data are simultaneously played by the master headphone and the slave headphone, and the technical problems of high technical difficulty, probable radiation hazards to a human body and high transmission power consumption, which are caused by application of RF as the Bluetooth headphone, are solved. The audio playing method of the embodiment comprises the master headphone, the slave headphone and a wireless communication module arranged in the master headphone, wherein the master headphone is connected with the audio equipment through the wireless communication module and connected with the slave headphone through NFMI.