Diagnosis circuit for microphone

The utility model relates to a diagnosis circuit for a microphone, comprising an external interface used for being accessed to the microphone, wherein the external interface is connected with an analogue/digital conversion interface of a master control chip via an RC (remote control) network. The RC network is formed by serially connecting a resistor and a capacitor. The diagnosis circuit for a microphone disclosed by the utility model determines the working state of the microphone by the level change of the input port of the microphone only via a resistor and a capacitor, thus being capable of accurately determining that the microphone is in a normal working state, or an open-circuit working state or a short-circuit working state.