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The utility model discloses a kind of double-cycle water cooling devices for ship propulsion motor, a kind of double-cycle water cooling devices for ship propulsion motor, including double-cycle cooling assembly, the double-cycle cooling assembly including outer water inlet valve, heat exchanger, circulating water pump, expansion water tank and cooling liquid inlet valve, water inlet, water outlet, cooling liquid inlet and cooling liquid outlet are set on heat exchanger, after forming outer circulation channel between water inlet and water outlet on heat exchanger with the series connection of outer water inlet valve, after forming internal circulation cooling loop between cooling liquid inlet and cooling liquid outlet on heat exchanger with the series connection of circulating water pump, expansion water tank, cooling liquid inlet valve and ship propulsion motor, it is characterized by: in double-cycle cooling assembly is installed in a box, it has certain protection level, can reduce the damage caused by the adverse environment of engine room to internal equipment, device, and integrated degree is high, modularization, save installation space.