The utility model discloses a marine fuel cell cooling system, include battery packaging case and distribution radiating shell bottom battery packaging case, the radiating shell is cavity structures,and the radiating shell bottom distributes respectively has inlet tube and outlet pipe, and the inlet tube passes through first connecting pipe and the water pump delivery port is continuous, and theoutlet pipe is linked together through second connecting pipe and radiator, and the pump intake is linked together through third connecting pipe and radiator. The utility model discloses can be underthe prerequisite of guaranteeing fuel cell normal operating, the ingenious gives the sea water with heat transfer, has saved traditional heat radiator's radiator fan simultaneously, and the shortcoming of having overcome that traditional heat radiator is bulky, the power consumption is high, the noise is big etc. Provides for the visitor on the ship and staff and experiences better.