The invention discloses a laser quenching device which comprises a working table and a laser assembly disposed above the working table, wherein the laser assembly comprises a laser, a beam expander, agalvanometer and an F-Theta lens arranged in sequence in a beam transmission direction. The multi-dimensional dynamic galvanometer ensures that light spots cannot be distorted within an effective range; the software control is accurate, the quenching depth can be precisely controlled, and the laser output energy, a scanning path and the like can be precisely controlled, so that an internal crystal structure is more refined, a hot deformation zone of a probe and the overall change are small, the product consistency and the yield rate are greatly improved, the hardness is increased by 15% to 20% compared with that of the conventional quenching, and the wear resistance can be increased by 3-4 times; no relatively long-term pretreatment and heating of the conventional method are required; theenergy consumption is reduced; laser-scanned probes do not need to be immersed in anti-rust oil, thereby reducing secondary pollution; and the laser quenching device is short in process cycle, high in production efficiency and low in cost, can be incorporated into a production line, and facilitates mass production.