Fuel cell engine cold energy utilization system, control method and fuel cell engine

The invention discloses a fuel cell engine cold energy utilization system, a control method and a fuel cell engine. The fuel cell engine cold energy utilization system comprises a heat dissipation system and an air system. The cooling system comprises a radiator, a temperature sensor, a water pump, an electric pile, a hydrogen plate heat exchanger and an intercooler; the air system comprises an air compressor connected with the intercooler, and the air compressor is connected with an air filter; the hydrogen plate heat exchanger is connected with the liquid hydrogen gasification device, a flow guide cover is arranged between the liquid hydrogen gasification device and the radiator, liquid hydrogen exchanges heat with ambient air through the liquid hydrogen gasification device to reduce the temperature of the ambient air, and the low-temperature ambient air becomes an air inlet source of the radiator through the flow guide cover. Cold energy generated after liquid hydrogen is gasified is used for reducing the