The invention discloses a differential capacitive MEMS (Micro-Electro-Mechanical System) microphone. The differential capacitive MEMS microphone comprises a circuit board, a first MEMS chip and a second MEMS chip, wherein the first MEMS chip comprises a first substrate arranged on the circuit board, and a first capacitor which is arranged on the first substrate and comprises a first back polar plate positioned above, a first vibration film positioned below and a first isolation layer arranged between the first back polar plate and the first vibration film; the second MEMS chip comprises a second substrate arranged on the circuit board, and a second capacitor which is arranged on the second substrate and comprises a second back polar plate positioned below, a second vibration film positioned above and a second isolation layer arranged between the second back polar plate and the second vibration film; and the first capacitor and the second capacitor construct a pair of differential capacitors. Through adoption of the differential capacitive MEMS microphone disclosed by the invention, external noise signals can be filtered; the signal-to-noise ratio is increased; and the performance of a microphone product is enhanced.