The invention provides a mine micro-seismic source. A pulse signal is generated by a single chip microcomputer and can be used for controlling an intrinsic safety type three-way solenoid valve to work, so that a pneumatic hammer is driven by compressed air to hit a copper cushion plate and microseism is generated; the pneumatic hammer is fixed on a surrounding rock of a roadway through a tripod and an anchor rod. A hitting period of a seismic source system is adjustable from 10 seconds to 1000 seconds, so that a generated seismic focus signal is good in consistency. The mine micro-seismic seismic source is simple and firm in system structure, and can be widely applied to various micro-seismic detection fields of mine.