Visible and controllable overlong gravity piston type sampling system in deep water

The invention belongs to the field of sea floor exploration and particularly provides a visible and controllable overlong gravity piston type sampling system in deep water. The sampling system comprises a deck system on water, and a framework, a hydraulic winch, a control bucket, an underwater camera, a hydraulic working station, a sampling mechanism and an energy storage pneumatic hammer mechanism, which are located underwater, wherein the hydraulic winch is installed on the top part of the framework and is connected with the underwater camera through a watertight cable, and the control bucket is installed in the framework and is electrically connected with the deck system; the hydraulic working station is installed on the framework below the control bucket and is respectively connected with the control bucket and the hydraulic winch; and the energy storage pneumatic hammer mechanism is fixed on the bottom part of the framework, and the sampling mechanism is connected on the lower end of the energy storage pneumatic hammer mechanism. The visible and controllable overlong gravity piston type sampling system in deep water provided by the invention is high in integration degree, strong in system expansibility and is capable of adopting a vertical folding and unfolding mode through the deck system to greatly save the deck space, so that the sampling system has good ship practicability.