Sewage treatment system

The utility model discloses a sewage treatment system which comprises a pump station used for pumping municipal sewage, a grating tank used for intercepting and removing large-particle-size suspended solids and floating objects in the sewage, a grit chamber used for removing gravel in the sewage, an adjusting tank used for adjusting the water quantity and balancing the water quality, and a sewage treatment equipment group used for purifying the sewage, the disinfection device is used for disinfecting the water flow; the pump station, the grating tank, the grit chamber, the regulating tank, the sewage treatment equipment group and the disinfection device are communicated in sequence; a liquid level meter and a stirrer are arranged in the adjusting tank; the sewage treatment equipment group sequentially comprises an anaerobic treatment tank, an anoxic treatment tank, an aerobic treatment tank, a sedimentation tank and a filter tank, the anaerobic treatment tank, the anoxic treatment tank and the aerobic treatme