Edge laser hardening machine is a laser surface heat treatment machine for laser hardening of the cutting edge of the tool. It is a laser surface heat treatment equipment developed for the hardware tool industry. It adopts a continuous wave semiconductor laser, and its optical system is optimized according to the characteristics of the cutting edge. Design, instead of traditional induction hardening, while improving the hardness of the cutting edge, the martensite crystal branches of the cutting edge are refined to the greatest extent, so that the cutting edge can maintain good toughness.