Hydraulic engineering desilting device

The utility model relates to the technical field of water conservancy projects, in particular to a water conservancy project desilting device which comprises a ship body, a desilting pump is arranged on the ship body, a mud pumping opening of the desilting pump is connected with a mud pumping pipe, a mud outlet of the desilting pump is connected with a separation assembly through a mud outlet pipe, and the separation assembly comprises a separation box extending in the horizontal direction. One end of the separation box is connected with a sludge outlet pipe, the other end of the separation box is connected with a sludge storage box through a sludge discharge pipe, a rotating shaft is rotationally connected into the separation box, the axial direction of the rotating shaft is the same as the extending direction of the separation box, a motor is arranged on the separation box, and a spiral blade which extends in the axial direction of the rotating shaft and is in a spiral shape is arranged on the side wall of