Purifying tank for treating dispersion-type domestic sewage

The utility model relates to a domestic sewage treatment device and particularly relates to a purifying tank for treating dispersion-type domestic sewage. The purifying tank comprises a tank body, a water inlet, a water outlet, an inspection opening and a seal cover matched with the inspection opening, wherein the tank body is internally divided into an anaerobic chamber, an anoxic chamber, an aerobic chamber, a sedimentation chamber and a sterilization chamber by virtue of partition plates, the anaerobic chamber is divided into a facultative zone and an anaerobic zone of which the bottoms are communicated by virtue of a baffle plate, the water inlet is formed in the upper part of the facultative zone and the water outlet is formed in the upper part of the sterilization chamber. The purifying tank has the advantages that (1) the purifying tank is highly integrated, the arrangement of an additional septic tank in the front end of the purifying tank is not needed and the domestic sewage discharged from toilets, kitchens, bath rooms, washrooms and washing machines can be purified; (2) the sewage can automatically flow into the system by means of the gravity without externally additional power and thus the energy source is saved and (3) the investment is less, the maintenance and management of the operation are simple, the system is convenient to overhaul and the overhaul can be completed without entering the inside of the device.