Sorting site sewage purification circulating system

The utility model relates to a sewage treatment system, in particular to a sewage purification circulating system on a separation site, which is characterized in that the water outlet end of a sewage pipe is connected with the water inlet of a cyclone, the water outlet of the cyclone is connected with a primary sedimentation tank, and the water outlet of the primary sedimentation tank is connected with the water inlet of a secondary sedimentation tank; a water outlet of the second-stage sedimentation tank is connected with a water inlet of the third-stage sedimentation tank, a cation stirring pump is arranged in the first-stage sedimentation tank, a feed port of the filter press is communicated with the sedimentation tank, the first drainage pipe is connected to the second-stage sedimentation tank, and the first drainage pipe flows back to the separation system through a chute; the first drainage pipe is used for outputting primary filtered water in the secondary sedimentation tank to wash materials, the seco