Using liquid nitrogen as the refrigerant and an intelligent temperature control system, the required temperature and insulation time can be set according to process requirements, with process recording and remote monitoring functions. The equipment adopts advanced low-temperature technology and a unique cold air circulation system, fully utilizing liquid nitrogen cooling energy to achieve uniform, stable, and rapid cooling of the workpiece. After the end of deep cooling, continuous heating can be achieved to achieve the purpose of tempering. After cooling treatment, the parts can achieve the following characteristics: reduced austenite, long-term no deformation of the product, increased hardness and uniformity, improved mechanical properties, and improved wear resistance.