River dredging, screening and desilting device

The utility model relates to the technical field of river dredging, and provides a river dredging, screening and dredging device which comprises an outer frame, an impurity separating mechanism and a dewatering mechanism are arranged in the outer frame, the impurity separating mechanism comprises a screening assembly and a vibrating assembly, a water tank is arranged on one side of the screening assembly, and the bottom of the screening assembly is communicated with the input end of a sludge conveying pump. The output end of the sludge conveying pump communicates with the dewatering mechanism, the screening assembly and the water tank are arranged on the vibration assembly, the dewatering mechanism comprises a rotating seat, a rotating cylinder and an auger are arranged in the rotating seat, the auger and the rotating cylinder are coaxially arranged and located in the rotating cylinder, the rotating direction of the rotating cylinder and the rotating direction of the auger are opposite, and the feeding end of