Underwater sediment collector

The utility model relates to the technical field of underwater sampling, and discloses an underwater sediment collector which comprises an outer box body and a base, a handle is arranged on the upper side of the outer box body, a plurality of supporting legs are arranged on the lower side of the base, an inner box body is arranged in the outer box body, and a collecting mechanism is arranged on the lower side of the inner box body; motors are arranged on the two sides of the inner box body and drive the inner box body to move; and a protection plate is arranged on the lower side of the base. The outer box body is put into water through the handle, when the outer box body falls into the water bottom, the motor drives the inner box body to move towards the water bottom, so that the inner box body is in full contact with the water bottom, and then collection and sampling are performed at the water bottom through the collection mechanism. The underwater sampling device has the advantages that samples can be colle