Sewage treatment submersible pump convenient to maintain

The utility model discloses a sewage treatment submersible pump convenient to maintain, which comprises a pump body base, a filter screen is arranged in a movable plate, and a fastening bolt is connected between the movable plate and a movable shell. The sewage treatment submersible pump convenient to maintain is provided with the movable shells, the movable shells can be driven by rotation of the threaded rods to adjust the positions along the limiting sliding grooves in the outer surface of the pump body base, the movable shells can be closed, and therefore a centrifugal impeller in the device is convenient to maintain or replace; a water collecting cover is arranged on the outer side of the centrifugal impeller, so that the sewage cannot be interrupted in the conveying process; a backflow valve is arranged on the outer side of the water outlet pipe, so that the sewage cannot flow back in the conveying process, a movable plate is connected to the tail end of a movable shell through a fastening bolt, and a f