The invention relates to a differential capacitor type micro-vibration sensor. The sensor comprises two sensitive capacitors, wherein the sensitive capacitors comprise a metal capacitor movable pole plate, upper and lower capacitor fixed pole plates and two metal gaskets and change differentially along with the vibration of a base; a sensitive mass block is directly formed by the outer ring region of the metal capacitor movable pole plate without adding another sensitive mass block and connected with a fixed region firmly fixed on an installation stand column through more than three arc elastic cantilevers uniformly distributed along circumference; damping holes are uniformly distributed along the circumferential direction of a median diameter of the sensitive mass block; substrates of the capacitor fixed pole plates are made of ceramic materials; conductive metal films are coated in the outer ring region and the inner ring region which are insulated with each other; the metal film ofthe outer ring region is used for forming fixed electrodes of the sensitive capacitors, and a lead wire is directly welded from the side surface of the metal film; and the metal film of the inner ring region is used for conducting the movable electrode plate and a ground. The sensor has the advantages of high sensitivity, favorable frequency characteristic and strong overload resistant and impactresistant capabilities and simple structure.