Bucket wheel dredger is a large hydraulic operated combined dredger, which is suitable for inland waterway dredging, waterway and reservoir dredging. The dredging equipment of the whole ship adopts hydraulic drive and centralized control. The main ship of the ship is composed of three pontoons, which are integrated in use. The cab can be disassembled, and the height can be reduced through the bridge. When the ship turns into the water without connection, it can be disassembled and transported by car or train. The device can be equipped with throwing bolts, trolley and other devices. The transmission device is lubricated with lubricating oil, and the metal floating ring sealing device is positioned independently.