Domestic sewage treatment and discharge device

The utility model provides a domestic sewage treatment and discharge device, which relates to the technical field of domestic sewage treatment and comprises a fermentation box body, a fixing ring is fixed in the middle of the inner wall of one side of the fermentation box body, a butt joint block is rotatably connected in the fixing ring, a filter cartridge is fixed on one side of the butt joint block, and the filter cartridge is fixed on the other side of the fermentation box body. A filter cartridge is arranged in the fermentation box body, a sealing cover is fixed on one side of the filter cartridge, a fixing plate is fixed in the center of one side of the sealing cover, two fixing grooves are formed in one side of the fixing plate, and the filter cartridge and the fixing plate are both located in the fermentation box body. When the microorganisms decompose impurities in the filter cylinder, the impurities which cannot be decomposed only accumulate in the filter cylinder and cannot enter the fermentation b