Proton exchange film fuel cell

The invention discloses a proton exchange film fuel battery, which comprises the following parts: front lid board, back lid board and basic unit group between the front and back lid boards, wherein the baffle is set among the basic unit group to divide the unit into multiple basic unit subgroups to connect wetting device; the electrode board is set between the basic unit subgroup and wetting device; the water inlet channel, water outlet channel, gas inlet channel and gas outlet channel are set on the baffle; or the water inlet, water outlet, gas inlet and gas outlet are set on the back lid board. The invention reduces the flow quantity and flow speed of gas in the gas inlet and outlet well channel due to reducing the basic unit quantity of each basic unit subgroup, which improves the safety of fuel battery.