The invention discloses a heat engine phase-change radiator comprising a radiator shell and radiating fins. The inner cavity of the radiator shell is divided into an upper cavity and a lower cavity which are communicated to flow in one way through a supercharging and air sealing device, the bottom of the lower cavity is provided with circulating working fluid, an air spraying pipe extending into the upper cavity upwards is arranged on the lower cavity, the top of the upper cavity is provided with a bearing provided with a movable blade rotating around the bearing, the movable blade is arranged above the outlet of the air spraying pipe, and an energy converting device is mounted in the bearing connected to external electrical equipment through a wire. Heat absorbed by the radiator is converted partially inside the radiator into utilizable electricity or power, then the converted electricity is applied to the own electrical device or other electrical devices, waste heat is utilized fully, radiating load of the radiator is reduced after parts of heat is converted, and radiating effect is improved.