A reversing hydraulic motor of a radiator is characterized in that an electromagnetic directional valve, a one-way valve and an electromagnetic relief valve are all threaded cartridge valves and are installed on a rear end cover of the hydraulic motor in an integral manner; the rear end cover of the hydraulic motor is provided with an oil inlet connector P and an oil return connector T, and a connector of an oil inlet hole and a connector of an oil return hole are used for being connected with external pipes; the oil inlet connector P and the oil return connector T on the rear end cover of the hydraulic motor are connected with one end of the oil inlet hole and one end of the oil return hole respectively; pipe orifices in the two ends of the electromagnetic relief valve and pipe orifices in the two ends of the one-way valve are communicated with the oil inlet hole and the oil return hole respectively; the other end of the oil inlet hole and the other end of the oil return hole are connected with an oil inlet and an oil outlet in the two ends of the electromagnetic directional valve together respectively; and an oil inlet of the hydraulic motor is connected with the oil inlet of the electromagnetic directional valve together, and an oil outlet of the hydraulic motor is connected with the oil outlet of the electromagnetic directional valve together. Thus, the reversing hydraulic motor of the radiator is formed.