Sewage purification circulating system for separation site

The invention relates to a sewage treatment system, in particular to a sewage purification circulating system for a separation site. According to the system, a water outlet end of a sewage pipe is connected with a water inlet of a cyclone; a water outlet of the cyclone is connected with a first-stage sedimentation tank; a water outlet of the first-stage sedimentation tank is connected with a water inlet of a second-stage sedimentation tank; a water outlet of the second-stage sedimentation tank is connected with a water inlet of a third-stage sedimentation tank; a cation stirring pump is arranged in the first-stage sedimentation tank; a feed port of a filter press communicates with the first-stage sedimentation tank; a first drainage pipe is connected to the first-stage sedimentation tank, and the first drainage pipe flows back to a separation system through a chute; the first drainage pipe is used for outputting primarily filtered water in the second-stage sedimentation tank to wash materials; and a second dr