The invention provides a microphone device of an earphone system, which comprises a microphone and a vibration sensor, and is characterized in that the microphone is used for receiving a first signal, the first signal comprises a voice signal and a first vibration signal, and the vibration sensor is used for receiving a second vibration signal; the cavity volume of the vibration sensor is configured to enable the amplitude-frequency response of the vibration sensor to the second vibration signal to be the same as the amplitude-frequency response of the microphone to the first vibration signal, and / or enable the phase-frequency response of the vibration sensor to the second vibration signal to be the same as the phase-frequency response of the microphone to the first vibration signal; and the rear cavity volume of the vibration sensor is equal to the rear cavity volume of the microphone, and the front cavity volume of the vibration sensor is the equivalent volume of the front cavity volume of the microphone. The vibration signal on the shell received by the microphone and the vibration signal on the shell received by the vibration sensor can be consistent as much as possible, so that the voice signal received by the microphone can eliminate the influence of the vibration signal on the shell so as to improve the call effect of the earphone system.