Laser quenching is a quenching technology that uses laser to heat the surface of the material to above the austenite phase transition point. As the material cools itself, austenite transforms into martensite, thereby hardening the surface of the material. Laser quenching has high power density, fast cooling speed, and does not require cooling media such as water or oil. Compared with induction quenching, flame quenching, and carburizing quenching processes, laser quenching has a uniform hardened layer, higher hardness (generally 1-3HRC higher than induction quenching), small deformation of the workpiece, easy control of the heating layer depth and heating trajectory, and easy automation. It is not necessary to design corresponding induction coils according to different part sizes like induction quenching, and the processing of large parts is not subject to the limitation of furnace size during chemical heat treatment such as carburizing quenching. Therefore, in many industrial fields, laser quenching is gradually replacing traditional processes such as induction quenching and chemical heat treatment. It is particularly important that the deformation of the workpiece before and after laser quenching is almost negligible, which is particularly suitable for surface treatment of parts with high precision requirements.