The oxygen mask is a low-flow oxygen supply device, but compared with the nasal oxygen tube, which uses the nasopharyngeal cavity as the oxygen storage chamber, the oxygen inhalation mask has an additional 100-200l oxygen storage space in the body, which improves the oxygen supply efficiency. Oxygen breathing masks can not only ensure adequate oxygen supply, but also have the function of humidifying the airway, diluting sputum, and ensuring smooth respiratory tract.