Rapid flattening device for composite paperboard

The utility model discloses a composite paperboard rapid flattening device which comprises a fixing frame, first hydraulic cylinders are fixedly connected to the two sides, close to one inner side, of the top of the fixing frame, the driving ends of the two first hydraulic cylinders are jointly and fixedly connected with a pressing plate, and first motors are fixedly connected to the other inner side of the fixing frame. When the paperboard flattening device is used, a plurality of paperboards needing to be flattened are placed on the supporting plate, the first motor, the threaded rod, the sliding block, the second hydraulic cylinder and the push plate are arranged, the first motor rotates to drive the push plate to move, the push plate moves to push the paperboards on the supporting plate to the conveying belt, and the paperboards are located under the pressing plate. The two first hydraulic cylinders and the pressing plate are arranged, the two first hydraulic cylinders drive the pressing plate to descend