Papermaking middle-stage wastewater treatment system

The utility model relates to a papermaking middle-stage wastewater treatment system. The papermaking middle-stage wastewater treatment system comprises a grid, a water collecting tank, a fiber recycling room, a mixed reaction tank, a primary sedimentation tank, a hydrolytic acidification tank, an oxidation ditch, a secondary sedimentation tank, a sludge homogenizing tank, a sludge thickening tank and a sludge dehydrating room, wherein the grid, the water collecting tank, the fiber recycling room, the mixed reaction tank, the primary sedimentation tank, the hydrolytic acidification tank, the oxidation ditch and the secondary sedimentation tank are sequentially communicated, the primary sedimentation tank, the hydrolytic acidification tank, the oxidation ditch, the secondary sedimentation tank and the sludge thickening tank are respectively communicated with the sludge homogenizing tank, and the sludge thickening tank is communicated with the sludge dehydrating room. After papermaking middle-stage wastewater is treated by adopting the papermaking middle-stage wastewater treatment system, quality of treated effluent is good, pollution indexes such as COD, BOD and SS in the effluent reach drainage standard, and difficulty in the existing papermaking middle-stage wastewater treatment is solved, so that the papermaking middle-stage wastewater treatment system is applicable to general popularization and application.