Crab-bucket dredging device vith adjustable clutch

The utility model relates to a crab-bucket dredging device with an adjustable clutch, which comprises a diesel engine, a torque converter, a grab claw and the additional adjustable clutch, wherein, the adjustable clutch is installed between an output shaft of the diesel engine and an input shaft of the torque converter through a shaft coupling, and can carry out stepless speed regulation, so that the rotary speed input of a hydrodynamic torque converter is adjustable. Even when the rotary speed input of a pump wheel in the torque converter changes, a corresponding tuft of output characteristic curves of the torque converter can be obtained when the rotary speed of the pump wheel is different, and the capacity of the torque converter is increased, so that the grab claw can be reasonably matched with the diesel engine in different working conditions.