Heat dissipation control method of fuel cell system

The invention relates to a heat dissipation control method of a fuel cell system, which comprises the following steps: judging the number of initial fans required to be started according to the current of a fuel cell system stack, and starting the corresponding number of fans through a controller; according to the difference value between the actual temperature of the radiator outlet cooling liquid and the target temperature, the rotating speed of the started fan is adjusted through the controller, and the actual temperature of the radiator outlet cooling liquid is kept close to the target temperature; if the actual temperature of the cooling liquid at the outlet of the radiator is still higher than the target temperature of the cooling liquid at the outlet of the radiator after the rotating speed of the working fan is increased to the low noise value, adding one working fan through the controller; and if the rotating speed of the working fan is reduced to the low limit value and the actual temperature of the