Paperboard stacking production line

The paperboard stacking production line comprises a butt joint conveying mechanism, a climbing conveying mechanism, a stacking mechanism, a pre-pressing flattening mechanism and a stacking mechanism, the stacking mechanism is fixedly connected with a fixing plate, the surface of the fixing plate is rotationally connected with two sets of pulleys, a limiting rod for the pulleys to roll is arranged between one set of pulleys, and the other set of pulleys are fixedly connected with the climbing conveying mechanism. A limiting baffle is fixedly connected to one end of the limiting rod, a set of pushing air cylinders are fixedly arranged below the laminating mechanism, the telescopic ends of the pushing air cylinders are movably connected with linear bearings, and second connecting plates are fixedly connected to the surfaces of the linear bearings; the second connecting plate is fixedly connected with a plurality of square pipes, one end of each square pipe is fixedly connected with a paper sheet pre-stacking tra