The invention discloses a fuel cell unipolar plate structure. The structure comprises a plate body, four side edge embossments, two end portion embossments and a voltage signal acquisition end. The two end portion embossments are provided with an air inlet and an air outlet. The four side edge embossments are provided with a cooling water inlet, a cooling water outlet, a hydrogen gas inlet and a hydrogen gas outlet. One side edge of the plate body is provided with the voltage signal acquisition end. Through arranging a ring of sealing iron bar at the air inlet and outlet of a unipolar plate and the water inlet and outlet, the sealing iron bar is provided with several U-shaped extension portions, and the extension portions are provided with protuberances so as to increase pressure between anode and cathode plates and between a bipolar plate and a membrane electrode during assembling, and ensure sealing performance between each inlet or outlet and an external portion. The voltage signalacquisition end is provided with at least two slots. After the anode and cathode plates are welded to form the bipolar plate, the slots in the anode and cathode plates form a jack so that the state oflead welding during detection is avoided and the structure can be used conveniently.