The terminal is provided with a one-way valve and a microcatheter, the microcatheter is provided with a plurality of oval holes, the diameter of the side holes is smaller than the ends of the catheter and the hand pump, the infusion tube connected with the hand pump is terminated, the infusion tube is provided with a switch, and the liquid bag in the infusion tube is hung on the nose. There is also a measuring scale on the surface of the liquid bag. When used together, the microcatheter is placed at one end of the deep hole of the lateral hole of the microcatheter, located in the wound, and connected with negative pressure to prevent air leakage. The other end of the message sews the skin incision and the first piece of velvet from the lower end of the incision. The disposable negative pressure drainage bag is connected with the end of the check valve of the windward pump, squeezing the hand pump, and the switch at the bottom of the hand pump is closed, resulting in negative pressure leakage from the surgical incision. The utility model has the advantages of medical care, and can take appropriate measures in time according to the drainage situation to heal the incision as soon as possible.