Low-temperature starting control method and device for fuel cell system

The invention discloses a low-temperature starting control method and device for a fuel cell system, and relates to the technical field of fuel cells. According to the technical key points, the fuel cell stack hydrogen supply system comprises a fuel cell stack and a hydrogen supply system, a water pump is connected between loops of a cooling liquid inlet and a cooling liquid outlet of the fuel cell stack, and a DCF and a load are connected between a high-voltage positive electrode and a high-voltage negative electrode of the fuel cell stack; the filter is sequentially connected with a flow meter, a compressed gas module and a humidifying module, a first throttle valve and a second throttle valve are connected between the humidifying module and a connecting loop of the fuel cell stack, and the first throttle valve and the second throttle valve are connected in parallel; the control module is electrically connected to the water pump, the compressed gas module, the first throttle valve and the second throttle va