Hydraulic engineering desilting device for river channel

The invention relates to the technical field of river desilting devices, and particularly discloses a hydraulic engineering desilting device for riverways, which comprises a moving platform, the upper side of the moving platform is provided with a drainage tank, the side edge of the drainage tank is provided with a mounting plate, the side edge of the mounting plate is fixedly provided with a plurality of desilting ports, and the desilting ports are provided with filter bags in a matched manner. A downward pressing mechanism matched with the filter bags is arranged on the upper side of the drainage tank, a filter bag placing mechanism matched with the filter bags is arranged on the side edge of the movable platform, the silt discharging connector is provided with a silt suction mechanism and a flocculant conveying assembly in a matched mode, and the movable platform is provided with a silt pumping assembly matched with the butt joint pipe in a matched mode. Sludge can be conveyed into the filter bag to be col