An efficient thermal energy power engine is disclosed. A gasification reactor is arranged on a cylinder head of an internal combustion engine. Gasifying plates are arranged with gaps on the cylinder head. An upper portion of the gasification reactor is connected to an atomizer. The atomizer is connected to a pressure pump via a pipe. The pressure pump is connected to a liquid storage tank via a pipe. The liquid storage tank is connected to a cooler via a pipe. The cooler is connected to an exhaust passage via a pipe. Heat absorption plates are arranged inside the exhaust passage in parallel in an air flow direction. The heat absorption plates absorb thermal energy of exhaust gas and transfer the thermal energy to the gasification reactor. The cylinder body of the internal combustion engine is wrapped with an insulation layer.