Desilting device

The utility model relates to the technical field of sewage treatment equipment, in particular to a desilting device which comprises a box body, a sliding plate, a hollow column, a sliding assembly, a degassing assembly, two slag scraping assemblies and a dismounting unit, and the dismounting unit comprises two hydraulic cylinders, a connecting bin, two cross rods, a motor, a spiral blade, a rotating shaft and a discharging pipe. Gas in the box body is cleaned up, then a motor is started to drive a rotating shaft to rotate, so that a spiral blade rotates in a hollow column, silt at the bottom of the box body is discharged through a discharging pipe, a sliding assembly is started to move a sliding plate back and forth, the silt discharging efficiency is improved, and a hydraulic cylinder is started to move a connecting bin on a transverse rod upwards; the motor, the rotating shaft and the spiral blade move upwards as well, then the spiral blade is cleaned, then the hydraulic cylinder is started to restore to th