Drainage device and method for fuel cell system

The invention belongs to the technical field of fuel cells, and particularly relates to a drainage device and method for a fuel cell system. According to the technical scheme, the drainage device of the fuel cell system comprises a gas-water separator, the gas-water separator comprises a gas-water separation cavity and a water storage cavity which are communicated with each other, the bottom of the water storage cavity is provided with a water outlet, the water outlet of the water storage cavity is connected with a drainage valve, the other end of the drainage valve is connected with a pore plate, and the other end of the pore plate is connected with a drainage pipe. The invention discloses a drainage method of a fuel cell system. The drainage method comprises the following steps: S1, separating hydrogen and water in fluid at an anode outlet of a galvanic pile by using a gas-water separator; s2, when the power of the fuel cell is high, normally opening the drain valve; when the power of the fuel cell is low,