The mine laser methane remote detector is composed of a laser emission unit, a reflected light receiving unit, a laser detector and a control unit, etc. It uses the principle of methane gas's absorption of laser at a specific wavelength to rapidly detect the methane gas concentration in the unknown area ahead at a long distance. The laser emitted by the laser emission unit passes through the gas monitoring area, reaches the reflector and is diffusely reflected to the reflected light receiving unit. The laser detector feeds back the changes in the laser intensity it detects to the control unit for processing, and the integral concentration of the methane gas component along the laser transmission path is obtained.