Seawater sediment sampling device

The utility model belongs to the technical field of marine sediments, and particularly relates to a seawater sediment sampling device which comprises a shell, a foot plate is fixedly connected to the bottom end of the shell, a straight groove is formed in the lower surface of the foot plate, an inner cylinder is connected to the interior of the shell in a threaded mode, and a round piece is slidably connected to the interior of the inner cylinder. A steel needle is fixedly connected to the lower surface of the circular piece, a circular groove is formed in the upper surface of the circular piece, an edging cutter body is fixedly connected to the lower surface of the inner cylinder, and a connecting rod is fixedly connected to the top of the inner cylinder. The inner cylinder is arranged, the inner cylinder rotates anticlockwise to move downwards, so that the edging cutter body can be screwed into sediments to achieve the effect of cutting the sediments, the lower half part of the inner cylinder can surround t