Puncture device is a kind of medical equipment, which is commonly used in abdominal surgery and other minimally invasive surgery. It is a widely used surgical instrument. The puncture device can establish an access channel in the abdominal wall of the human body, so that other surgical instruments can enter the abdominal cavity, and provide a gas inlet and outlet channel. Since the puncture device is mainly used in pneumoperitoneum surgery, there is a high requirement for the air tightness of the puncture device. During surgery, the product is required to have no or only a small amount of gas leakage.