Turnover fixed support

The invention provides a turnover fixed support. The turnover fixed support comprises a movable bearing platform; the side supporting mechanism comprises an anti-sinking wheel and a mechanical arm rotationally connected to one end of the anti-sinking wheel, and the end, away from the anti-sinking wheel, of the mechanical arm is connected with the movable bearing platform; the automatic adjusting device comprises a base fixed to the movable bearing platform, a fixing support is installed on the base, an arc-shaped rotating frame is rotatably installed on the fixing support, a first sliding block is arranged on the base, the first sliding block is in sliding connection with the arc-shaped rotating frame, a tooth groove is formed in the arc-shaped rotating frame, and a first motor is installed on the inner side of the base. An output shaft of the first motor is connected with a gear meshed with the tooth groove, and the two ends of the arc-shaped rotating frame are connected with the supporting beams; and the bo