The water-coled low-temperature chiller unit can accurately control temperature, save energy and safety, and is suitable for low-temperature process requirements such as chemical and pharmaceutical, new energy, and material processing. The application fields are very wide: chemical and pharmaceutical low-temperature crystallization, fermentation tank temperature control, vaccine production, traditional Chinese medicine concentration, new energy, lithium battery cooling, fuel cell cooling, battery low-temperature testing, material processing: metal cryogenic treatment, carbon fiber cooling optical glass foming, scientific research: university laboratories, military environment simulation, computing center cooling.