The invention discloses a large-area uniform face electron source including an ultraviolet light source, a photo-etching steel net, an ultraviolet light source housing, a first gold cathode clamp assembly, a first MCP clamp assembly, a second gold cathode clamp assembly, a gold cathode, an MCP, a second MCP clamp assembly, a third MCP clamp assembly and an MCP clamp and gold cathode clamp connector. According to the invention, the gold cathode is adopted as a photoelectric conversion part, a micro-channel plate is used as an electron multiplying part for outgoing electrons of the gold cathode,a combination of the ultraviolet light source and the photo-etching steel net is adopted for providing uniform lighting for the gold cathode, and the current density magnitude of current of an outputface is adjusted through adjusting the plate voltage of the micro-channel plate. By adopting the face electron source having the above structure, uniform face current can be obtained.