Bucket wheel dredger, developed from the general cutter suction dredger, is one kind of new hydraulic dredger. The dredger is a combination of land used excavating bucket wheel and cutter suction dredger, which further improves and increases the cutting and digging ability of dredgers. The function of this new kind dredger is better than bucket chain dredger and cutter suction dredger. The bucket number is more than the bucket in bucket chain dredger, so it has high efficiency and low sand leakage. The bucket wheel dredger is suitable for excavating hard soil, cohesive soil, dense sand, ore and other materials because of its strong cutting and digging ability.