Light steel building wallboard is the main component of assembled light steel building. Many links in the production process are still rely on manual work with low automation level and low production efficiency, which can not meet the market demand. Aimed at the link of base plate laying screw lock in the production of light steel building wallboard, an automatic screw locking device was designed to improve the quality and efficiency of screw locking and reduce the manufacturing cost. The production process of assembled light steel building wallboard was analyzed and the requirements of screw locking in the process of substrate paving were clarified. According to the overall design scheme of the automatic screw machine, combined with the production process and the actual size requirements of the wallboard workpiece, the detailed structural design of the automatic screw machine was carried out, and the control system was designed for it.