The invention discloses a full-automatic welding clamp for a hydrogen cell bipolar plate. The clamp comprises a lower clamp and an upper clamp and further comprises an upper permanent magnet and a lower permanent magnet, the upper permanent magnet is arranged in the upper clamp, the lower permanent magnet is arranged in the lower clamp, two connecting holes are formed in the side edge of the upperclamp, two positioning pins are arranged in each seal frame of a profiling pressing plate of the lower surface of the upper clamp, the profiling pressing plate is attracted on the upper clamp throughthe upper permanent magnet, and the lower clamp is fixedly arranged on a worktable through a screw. Through automation of the bipolar plate welding clamp and overcoming of influences of unstable hotdeforming and pressure on the precision, the natural suction force effect of the permanent magnets is used for enabling the clamp to have the better absorption effect than the electromagnets and saveenergy, hot deforming is not generated, the machining precision cannot change product performance due to heating in the batched production, production efficiency is improved during full-automatic production, and production cost is reduced.