The invention discloses a MEMS (Micro-Electro-Mechanical System) microphone. The MEMS microphone comprises an upper plate, a middle plate and a lower plate; the upper plate is provided with a sound inlet; a first metal layer is arranged on the inner side wall of the sound inlet; the first metal layer extends to the upper surface of the upper plate; the middle plate is provided with a containing space penetrating the upper and lower surfaces of the middle plate; a second metal layer is arranged on the inner side wall of the containing space; the lower surface of the upper plate is fitted to the upper surface of the middle plate, and blocks the containing space; the first metal layer is communicated with the second metal layer; the lower plate is fitted to the lower surface of the middle plate, and blocks the containing space; the lower plate is provided with a grounding circuit; and the second metal layer is communicated with the grounding circuit. By means of the MEMS microphone in the technical scheme of the invention, external electrostatic discharge can be conducted to the grounding circuit from the first metal layer, and then released; therefore, damage of external electrostatic interference on the MEMS microphone can be reduced; the effect of protecting the product is realized; and simultaneously, the MEMS microphone has the radio-frequency anti-interference capability.