Nostril ventilation type cannula with drug coating protection function

The invention discloses a medical instrument, and particularly relates to a nostril ventilation type cannula with a drug coating protection function. A contact is arranged on one side of the contact air pipe and naturally attached to nostrils, the outer side of the contact is coated with medicine capable of being absorbed by the skin, a clamping head is arranged on the other side of the contact air pipe, a connecting air pipe is arranged on the contact air pipe, and a butt joint is arranged at the end, close to the contact air pipe, of the connecting air pipe. An installation head used for being connected with equipment is arranged at the end, away from the contact air pipe, of the connecting air pipe, and the contact air pipe and the connecting air pipe are connected through cooperation of the clamping head and the butt joint. The cannula body is made of polyurethane which is good in biocompatibility and low in friction coefficient so that friction between the cannula body and the inner wall of the nostril c