Sewage treatment sedimentation tank

The utility model relates to a sewage treatment settling pond, which comprises a settling pond, the bottom of the settling pond is inclined, a drain outlet is arranged on the higher side of the bottom of the settling pond, a bearing plate is laid at the bottom of the settling pond, the side of the bearing plate close to the drain outlet is hinged with the bottom of the settling pond through a hinge seat, and a baffle is upwards arranged at the end of the bearing plate far away from the drain outlet. The side, close to the drain outlet, of the baffle abuts against a long-strip-shaped sliding block, flanges are upwards arranged on the bearing plate at the two ends of the long-strip-shaped sliding block, sliding grooves are formed in the side faces, close to the long-strip-shaped sliding block, of the flanges, the sliding grooves are parallel to the upper end face of the bearing plate, protrusions are arranged at the positions, corresponding to the sliding grooves, of the two ends of the long-strip-shaped slidin