The invention discloses an oropharyngeal airway with closed air sac, including a double lumen pipe, wherein the port of the double lumen pipe can be connected with a breathing air sac. The double lumen pipe includes a conjoined oxygen intake pipe, an oropharyngeal exhaust pipe. The diameter of the oropharyngeal exhaust pipe is larger than the diameter of the oxygen intake pipe. The vent pipes of the oropharyngeal exhaust pipe and the oxygen intake pipe are provided with cover body holes which can move up and down along the oropharyngeal exhaust pipe and the oxygen intake pipe. A closed air sac is connected around the cover body hole. An air sac valve is arranged on the closed air sac. A fixed long belt and a fixed short belt which can be matched and stably connected are provided on two sides of the closed air sac. The oropharyngeal airway divides the intake and exhaust pipes into a double pipe mode, is combined with the closed air sac, greatly improves a patient's absorption capacity of oxygen, eliminates the waste of oxygen resources, can also prevent the pipeline from falling off, thereby avoiding the occurrence of medical accidents, and the closed air sac is combined with auxiliary breathing equipment, can recover the patients who cannot breathe spontaneously, and has the advantages of small compression area and no side injuries around mouths.