This equipment adopts a cascade compressor for refrigeration, utilizing the principle of thermal balance and circulating stirring to achieve automatic uniform cooling and constant temperature of the sample. The equipment is easy to operate, efficient, and controlled by single-chip technology, with digital temperature values, automatic temperature control, automatic timing, and automatic alarm. It is easy to operate and safe, with fast refrigeration speed, large volume, and high temperature control accuracy, making it an ideal sample cooling equipment for low-temperature impact testing of materials.