Rapid clamping device of large aperture ultrathin flat plate

The utility model relates to a rapid clamping device of a large aperture ultrathin flat plate. The rapid clamping device comprises a positioning assembly, a pressing assembly, and a rotation assembly. The rapid clamping device of the large aperture ultrathin flat plate is simple to operate and accurate in positioning. With the rapid clamping device, positioning and tight locking of a flat plate assembly can be finished quickly in measuring, and three-step accurate positioning and mounting is achieved in each measurement. The center position of a large size flat plate is kept unchanged when the posture of the large size flat plate is adjusted, and high accurate measurement for the indexes of the flat plate is guaranteed.