Biological/photoelectric/solar coupling sewage treatment integrated device

The invention discloses a biological/photoelectric/solar coupling sewage treatment integrated device, and belongs to the technical field of sewage treatment and environmental protection. The problems that in the prior art, the sunlight utilization efficiency is low, the mineralization rate of refractory organic matter is low, and the difficulty of building a large-scale water plant in rural areas is high are solved. According to the device provided by the invention, sewage firstly enters the biological treatment unit, the treated sewage enters the precipitation treatment unit to be separated into sludge and clarified liquor, the clarified liquor enters the photoelectric reaction unit to be subjected to photoelectric catalytic oxidation treatment, and the treated water is discharged through a water outlet of the photoelectric unit; meanwhile, sunlight irradiates the solar cell panel through the photoelectrocatalysis reaction water tank to generate electric energy, and the electric energy is provided for operat