The invention relates to a turnover device of an ultrathin plate glass box, which is characterized by comprising a rack (1), wherein a group of support beams (1c) are arranged on the upper side of the rack; a rotating frame (2) rotationally matched and connected with the two sides of the upper part of the rack via bearing supports (3); the rotating frame is matched with the beams in a support manner; a motor (4) is fixedly connected into the rack; the motor is connected with a speed reducer (5); a rotating shaft (6) is connected with an output shaft of the speed reducer; one end of the rotating shaft (6) is fixed on the output shaft; the other end of the rotating shaft (6) is connected with one end of an oscillating rod (15); and the other end of the oscillating rod (15) is articulated and fixed on the rotating frame (2). The device has the advantages that the device is simple in structure, convenient to operate, low in labor intensity and good in use effect, can turn over ultrathin float glass that is less than 0.55 mm in thickness into a vertical state from a horizontal stacking state and facilitates transfer and storage of subsequent ultrathin glass finish products.