The present disclosure relates to an analog microphone and a control method thereof. The analog microphone comprises: a sensor for sensing a sound and converting the sound into an electrical signal; acharge pump used for providing bias voltage for the sensor so as to drive the sensor; a source follower used for receiving the electrical signal and converting the electrical signal into a source follower signal; a gain adjustable amplifier used for receiving the source follower signal, multiplying the source follower signal by an amplification factor and outputting an amplified signal; and a detection module used for adaptively controlling the bias voltage of the charge pump and the amplified signal of the gain adjustable amplifier in response to the source follower signal of the source follower.