The WDH-10 constant temperature liquid circulation pump adopts an air-cooled fully enclosed compressor unit for refrigeration and a microcomputer intelligent control system. It has the function of providing low-temperature liquid and low-temperature water bath to meet the cooling or constant temperature requirements of other instruments using cooling water and low-temperature liquid. Multiple volumes can also be directly subjected to low-temperature and constant temperature experiments in the tank. It can be equipped with rotary evaporators, low-temperature chemical reaction vessels, freeze dryers, double-layer glass reaction vessels, UV spectrophotometers, magnetic stirrers and other instruments for circulating refrigeration, and can perform multifunctional chemical reactions, biological reactions, drug reactions, etc. at low temperatures.