The utility model discloses an incision protector with function of discharging fume contains last holding ring, lower holding ring, protection film and the system of discharging fume. The system of discharging fume contains into mouth, smoke exhaust passage and negative pressure connection port. The edge of holding ring is down on discharging fume the smoke exhaust passage edge systematic, and theedge of laminating protection film arrives down the holding ring, it establishes under on the holding ring or establishes under the holding ring near to advance the mouth. The smog that produces in the operation gets into the system of discharging fume through advancing the mouth, is aspirated out externally along smoke exhaust passage from negative pressure connection port to get rid of the interference of smog to the thoracoscope, guaranteed the clarity in the operation process operation field of vision, and played fine guard action, the convenient more and safety of operation process to patient and doctor.