A mobile communication peripheral device includes a main body, a circuit board, an earphone and a microphone. An identification card is disposed on a surface of the main body. The circuit board is disposed within the main body, and includes a transceiver for receiving and emitting a wireless communication signal and a signal processing device electrically to the transceiver for processing the wireless communication signal. The wireless communication signal includes a first audio signal. The earphone is coupled to the main body via a connecting wire for receiving and sending out the first audio signal. The microphone is coupled to the main body via the connecting wire for receiving a second audio signal.