A turnover device for turning over a substrate comprises a motor and a tumbler driven by the motor to rotate. The tumbler is provided with a transmission mechanism thereon and connected to an upper turntable and a lower turntable with the transmission mechanism, the tumbler can drive the upper turntable and the lower turntable to rotate, the transmission mechanism can drive the upper turntable and the lower turntable to move toward each other, and the substrate to be turned over is disposed between the upper turntable and the lower turntable.