The utility model discloses an evaporating temperature-adjustable calorimeter. The calorimeter is isolated from an environment insulating layer, and a liquid refrigerant in an evaporator exchanges heat with a mechanical device. The heat for evaporating the refrigerant is provided by an electrical heating element. The heating power of the electrical heating element is controlled by an instrument having the PID adjusting function. The consumed electric energy is metered by a high-precision electronic energy meter. When the temperature of the refrigerant is stabilized, the electric energy consumed within a certain period of time is recorded. In view of the calorific value of the mechanical device and the heat leakage of the environment, the refrigerating capacity of a refrigeration device or a compressor can be fingered out. By means of the evaporating temperature-adjustable calorimeter, the evaporating temperature of the refrigerant can be adjusted within a certain range, so that the refrigerating capacity of the refrigerant at different evaporating temperatures can be measured. Therefore, the refrigeration performance of the refrigeration device or the compressor can be evaluated more comprehensively. Meanwhile, the experiment speed is faster.