Sludge discharge device for sewage treatment

The utility model discloses a sludge discharge device for sewage treatment, which relates to the technical field of sewage treatment and comprises a sewage storage tank, a water inlet pipe is fixedly mounted at the upper end of the sewage storage tank, and two material smoothing plates are fixedly mounted in the sewage storage tank. Sludge can be discharged from a sludge discharging pipe through rotation of a spiral blade, the situation that the sludge discharging pipe is blocked when the sludge is discharged is relieved, sludge discharging is smoother, a second motor is started, a threaded rod is made to rotate, a scraping plate is driven to move through rotation of the threaded rod, and sludge attached to a material smoothening plate can be scraped off through movement of the scraping plate; the sludge falls between the two fixing plates and is intensively discharged from the sludge discharge pipe through the rotation of the rotating shaft and the spiral blade, so that the effect of cleaning the sludge at t