Fuel cell system control method and device and fuel cell passenger car

The invention discloses a fuel cell system control method and device and a fuel cell passenger car, and belongs to the technical field of fuel cell passenger car control. When the fuel cell system needs to be stopped actively or passively, the whole vehicle controller determines to send a stop command or an emergency stop command to the fuel cell system by judging the real-time state of the whole vehicle, and controls high-low voltage power supply of the whole vehicle according to the real-time state to meet the stop or emergency stop requirement of the fuel cell system. And the whole vehicle stop or sudden stop instruction is ensured to be consistent with the actual execution process of the fuel cell system. The fuel cell system can be matched with a correct shutdown process according to the state of the whole vehicle, and shutdown errors of the fuel cell system are reduced. The problem that the risk of shutdown errors exists in shutdown of the fuel cell system in the prior art is solved. 本发明公开了一种燃料电池系统控制方法、