The invention discloses a plate lamination mechanism which comprises a barrel conveyer belt, a carrier, a holding unit, a lifting unit and a lamination unit, wherein the barrel conveyer belt comprises transmission rollers; the lifting unit comprises a lifting cylinder and a lifting plate which is fixed on the piston rod of the lifting cylinder; the lamination unit comprises a bracket as well as a support mechanism and a lamination mechanism which are mounted on the bracket; the support mechanism comprises a screw rod which spans above the barrel conveyer belt, and a pair of upper support blocks which are oppositely mounted on the screw rod; the support blocks comprise moving blocks which are screwed on the screw rod, connecting rods which are fixedly connected below the moving blocks, and a support plate which is fixedly connected at the bottoms of the connecting rods; the lamination mechanism is positioned between the pair of the support blocks; and the lamination mechanism comprises a lamination cylinder which is fixed on the bracket, and a lamination plate fixed on the piston rod of the lamination cylinder. By adopting the plate lamination mechanism, a plate can be prevented from warpage in the lamination process, and the purposes of lamination and flattening can be achieved.