Improved nasal oxygen cannula

The utility model provides an improved nasal oxygen cannula which comprises a three-way gas-guide tube and a breather tube, the three-way gas-guide tube is provided with a gas inlet tube and two gas outlet tubes, the end portions of the gas outlet tubes are respectively provided with a threaded bayonet, the end portion of the breather tube is provided with a threaded connector connected with the threaded bayonet, and the threaded connector is connected with the threaded bayonet. Symmetrical ventilation holes are formed in the positions, corresponding to the nostrils of the human body, of the middle of the ventilation pipe, and nose wing supports are arranged on the outer side walls of the ventilation holes respectively. When oxygen is conveyed, the oxygen catheter does not need to be inserted into the nostrils of a patient, the comfort of the patient in the oxygen conveying process is improved, the breather pipe can be effectively fixed through the nose wing supports and is not prone to falling off, the fixin