Drill pipe type sampling device for detecting section composition of sandy beach

The utility model discloses a drill pipe type sampling device for detecting the composition of a sandy beach profile, which comprises a trigger steel wire rope, a handle rod, a connecting rod and a dovetail sampler, the handle rod and the connecting rod are both of hollow tubular structures, the trigger steel wire rope is arranged in inner cavities of the handle rod and the connecting rod in a penetrating manner, and the dovetail sampler is arranged in the inner cavity of the connecting rod. The two ends of the connecting rod are detachably connected with the handle rod and the dovetail sampler respectively, one end of the trigger steel wire rope is connected with the dovetail sampler, and the other end of the trigger steel wire rope extends out of the handle rod and is limited through a pull ring arranged at the end of the trigger steel wire rope. And the trigger steel wire rope correspondingly controls the opening and closing of the dovetail sampler by dragging the pull ring. The device can select connectin