The invention relates to a full-automatic laminate spot welding production device and its application method, comprising a laminate translation machine, a rib feeding device, a reinforcing conveyor, a front frame, a front conveyor belt, a gantry welding machine, a board grabbing device, a rear Conveyor belts, rear racks and shelf turners. The laminate translation machine, the front frame, the gantry welder, and the rear frame are connected in sequence, the front conveyor belt is arranged on the front frame, and the laminate translation machine and the gantry welder are connected front and rear, and the gantry welder and the rear frame They are installed on the rear side of the front frame in turn, the plate grabbing device is set behind the gantry welding machine, the rear conveyor belt is set on the rear frame to connect with the plate grabbing device, and the laminate turning machine is set above the rear frame, close to the rear end of the rack. The production equipment of shelf laminates is integrated into one production line, which improves production efficiency, is safe and reliable, saves energy, and solves the problem of difficult labor in the production plant.