Abstract: Aiming at the extensive management and low intelligent and informatization level in traditional section steel production, this paper investigates the layout and application of an intelligent manufacturing line for modular box-type steel structures. The production line adopts a streamlined production mode and integrates advanced processing equipment and robotic technology to realize the linkage of automatic assembly, welding and straightening processes for section steel. A digital management platform is established to implement full-process production management, which enables real-time monitoring of equipment status, production progress and product quality, as well as intelligent production scheduling based on processing data. Application results demonstrate that compared with conventional steel structure production lines, the developed production line achieves substantial improvement in automation and digitalization performance. Labor productivity is elevated by 36%, and the manufacturing quality of structural components is effectively enhanced. This research provides a technical reference for the intelligent manufacturing of modular steel structures.