Ventilation device of lower jaw supporting combined ventilation mask convenient to adjust

According to the technical scheme, the convenient-to-adjust ventilation device of the lower jaw supporting combined ventilation mask is characterized in that the convenient-to-adjust ventilation device comprises the mask, one side of the mask communicates with a ventilation pipe, and a first cavity, a second cavity and a third cavity are formed in the ventilation pipe; when a patient inhales, the one-way structure in the third cavity is closed to prevent external air from entering the first cavity through the third cavity, the one-way structure in the second cavity is opened, anesthetic gas in the second cavity can enter the first cavity from the second cavity, gas in the first cavity can enter the mask, and when the patient exhales, the anesthetic gas in the first cavity can enter the mask. The one-way structure in the second cavity is closed, the one-way structure in the third cavity is opened, the first cavity and the second cavity are communicated, gas generated by expiration of a patient can be discharge