The utility model discloses a pressure driven video disc piston pump can be installed inside the seating nipple, set up in the play liquid valve of pump body lower extreme and feed liquor valve, set up in the piston and the reset spring of pump body inner chamber including pump body, from the top down to and set up in the dangling bonds board of pump body upper end, the pump body outside is equipped with a plurality of sealing washers, can form seal structure with the seating nipple, it can not open simultaneously or close to go out liquid valve and feed liquor valve, be formed with the step on the lateral wall of dangling bonds board, the diameter of its step department is greater than the diameter of pump body, the piston sets up the upside in reset spring, reset spring is pegged graft in proper order by polylith plug -in element and forms, plug -in element is narrow arc piece under the width, its middle part along arc orientation trompil, and the length in hole is greater than the width of plug -in element lower extreme. This pressure driven video disc piston pump simple structure, convenient operation, it can show the pollution that reduces the environment to utilize it to carry out the flowing back operation.