Fuel cell gas-water separation device capable of automatically controlling liquid level and drainage method of fuel cell gas-water separation device

The invention discloses a fuel cell gas-water separation device with an automatic liquid level control function in the technical field of hydrogen fuel cell drainage, which comprises a gas-water separator and a water tank, the volume of the water tank is smaller than that of the gas-water separator, a liquid level switch is arranged in the water tank, and an upper communicating pipe is communicated between the water tank and the gas-water separator. The bottom of the water tank is communicated with two one-way valves with different water outlet directions, an electromagnetic valve is arranged at the water outlet, the bottom of the gas-water separator is communicated with the two one-way valves through the same lower communicating pipe, and the electromagnetic valve is electrically connected with the liquid level switch through a direct-current power supply. When the height difference between the liquid level of the gas-water separator and the liquid level of the water tank is large enough (reaching delta H) a