A method for identifying an audio device, in which a mobile device starts to monitor pull out or insert of an audio device, when the mobile device connects the audio device, the mobile device starts to record, the audio device is identified as an audio smart key device in the case that characteristic data is received in a first preset time, and data is sent to the audio smart key device; turns off recording in the case that the characteristic data is not received in the first preset time; the audio smart key device is powered on and initialized, it sends audio data to the mobile device, subsequently, if the audio smart key device receives data sent from the mobile device in a second preset time, it processes the data; if the audio smart key device does not receive the data sent from the mobile device, the audio smart key device turns off; when the mobile device disconnects the audio device, the mobile device turns off recording and the audio device turns off. According to the present invention, a mobile device can identify a type of an audio device which is inserted into the mobile device, the mobile device sends data after ensuring that the audio device is an audio smart key device, thus, the method can prevent from any noise in the earphone, so the users can feel better.