The invention relates to an all-
solid-state photoelectrochemical water
decomposition hydrogen production device which comprises a cover plate, an
anode frame, a
cathode frame and a bottom plate, a
proton exchange membrane is arranged on the junction surface of the
anode frame and the
cathode frame, and the gel
electrolyte in the
proton exchange membrane is divided into two
layers; a
cathode layer, a cathode
current collector and a bottom plate are sequentially arranged on the bottom surface of the cathode frame; an
anode current collector, a photo-anode layer and a cover plate are sequentially arranged on the top surface of the anode frame; a
semiconductor film is loaded at the center of the photo-anode layer; a water inlet and a water outlet are respectively formed in the side surfaces of the anode frame and the cathode frame; an
oxygen outlet is formed in the cover plate; and a
hydrogen outlet is formed in the bottom plate, penetrates through the cathode
current collector and the cathode layer and is communicated with the inner cavity of the cathode frame. The problem that liquid
electrolyte in a traditional
system can leak can be solved, the distance between the photo-anode layer and the cathode layer can be shortened to several millimeters without causing
short circuit, and the
current density and the conversion efficiency of photoelectrochemical water
decomposition are effectively improved.