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The application discloses an ecological fishery breeding system sewage circulating treatment device, and relates to the technical field of sewage treatment.The device comprises a separation tank, a horizontal partition plate is arranged in the separation tank, and the inside of the separation tank is divided into an upper stirring chamber and a lower sedimentation chamber; a stirring mechanism is arranged in the stirring chamber, and the stirring mechanism comprises a vertically arranged stirring shaft and stirring blades arranged on the stirring shaft; the top end of the stirring shaft penetrates through the top of the tank and is connected with a driving mechanism; the bottom end of the stirring shaft penetrates through the horizontal partition plate and is rotationally connected with the horizontal partition plate; a wastewater inlet and a flocculant adding port are arranged on the top of the separation tank and are communicated with the stirring chamber; and the separation tank further comprises a drainage mechanism, which is arranged on the stirring shaft.The ecological fishery breeding system sewage circulating treatment device can promote chemical flocculation through physical stirring, can utilize an independent static space for physical sedimentation, and can automatically connect the two stages through centrifugal force, so that the efficient cooperation of physical and chemical multistage treatment is realized.