Adjustable oral cavity supporting device

The invention discloses an adjustable oral cavity supporting device which comprises an adjusting mechanism, a first supporting base plate and a second supporting base plate, the adjusting mechanism comprises a first adjusting assembly and a second adjusting assembly, and the first adjusting assembly comprises a first operation block, a first arc-shaped plate, a second arc-shaped plate and a first rotating shaft. The first adjusting assembly comprises a first operating block, a first rack, a second rack and a second rotating shaft, the first rotating shaft rotates to drive the first arc-shaped plate and the second arc-shaped plate to move, and the first supporting base plate and the second supporting base plate are close to or away from each other along with the first arc-shaped plate and the second arc-shaped plate correspondingly; the left-right width distance of the mouth of the patient can be adjusted, real-time adjustment can be carried out according to the sizes of the mouth shapes of different patients,