Percutaneous lung puncture trocar

The utility model discloses a percutaneous lung puncture trocar which comprises a trocar body, a tail column is arranged at the top of the trocar body, a circular protruding column is arranged at thebottom of the tail column, a needle tube is arranged at the bottom of the trocar body, the needle tube penetrates through the circular protruding column and extends into the tail column, and an anti-backflow valve is arranged in the tail column. A first spring is arranged on the side, on the top of the anti-backflow valve, of the inner wall of the tail column, and a first wedge block is fixedly connected to the end, away from the inner wall of the tail column, of the first spring. The anti-backflow sleeve needle is scientific and reasonable in structure and safe and convenient to use, the anti-backflow valve, the first wedge block and the second wedge block are arranged, the tail portion of the sleeve needle is automatically sealed when a biopsy needle or a sleeve needle core is pulled out, zero air pressure is fo