The invention provides an audio communication method and an audio communication device. The audio communication method comprises the steps of receiving a first audio signal sent by a mobile terminal at a predetermined first communication speed via an earphone sound channel interface; processing the first audio signal to obtain a fourth audio signal of an analog signal form; and sending the fourth audio signal at a predetermined second communication speed to the mobile terminal via a microphone interface. Under normal conditions, the communication speed of the microphone interface is higher than that of the existing earphone sound channel interface, so that the communication speed between devices can be improved when the microphone interface is used for sending the fourth audio signal. In addition, the predetermined second communication speed is used for sending the fourth audio signal, so that the mobile terminal can correctly receive and decode the fourth audio signal at a time, the probability of increasing the communication time due to the fact that the signal is sent again as an error occurs during decoding is reduced, and the communication speed is further improved.