Pre-reservoir wetland treatment system

The utility model discloses a pre-reservoir wetland treatment system, and belongs to the technical field of ecological restoration. A pre-reservoir wetland treatment system comprises a main reservoir and further comprises a pre-reservoir body, the pre-reservoir body is arranged to be multi-stage terrace type wetlands, and a drop weir body is arranged between every two adjacent stages of wetlands; the water flow retarding assembly is arranged at one end, close to the downstream wetland, of the drop weir body; wherein the drop weir body is provided with a reoxygenation assembly connected with the water flow slowing-down assembly; according to the utility model, the wetland of the pre-reservoir is designed into a multi-stage terrace type and is connected with the multi-stage terrace type by virtue of the drop weir, the sedimentation of silt and nutritive salt in water is promoted by prolonging the hydraulic retention time, and meanwhile, the nutritive salt is further absorbed, adsorbed and intercepted by virtue