The technological progress of the new energy automobile industry has put forward higher requirements for temperature control test technology. In order to meet the new needs of the testing of the new energy automobile industry, our company has developed a high and low temperature coolant test machine for the controller, which can not only test the controller's high temperature and low temperature tolerance, reliability and performance parameters, but also have the functions of heat dissipation efficiency, flow resistance, pressure drop and pressure resistance test. Optional functions such as multi-channel temperature control, precise flow control, pressure pulse control and constant power control are also added.