The invention provides a green laser comprising an LD (Laser Diode) pumping light source for emitting pumping light, a laser crystal for converting the pumping light into fundamental frequency light and a frequency-doubling crystal for converting the fundamental frequency light into green frequency-doubling light, wherein a pumping light partial reflecting film is coated on the light emitting surface of the laser crystal; and the pumping light which is not converted by the laser crystal is reflected into the laser crystal through the pumping light partial reflecting film. The pumping light partial reflecting film is coated on the light emitting surface of the laser crystal in the laser, thus, the doping concentration of the laser crystal can be reduced and the problems of nonuniformity in heat distribution and remarkable heat effect caused by higher doping concentration of the laser crystal can be avoided on the premise that the pumping light absorption efficiency of the laser crystal is kept not changed.