With the advancement of intelligent transformation in the manufacturing industry, the building steel structure industry is also facing an urgent need to enhance its intelligent manufacturing level. This article takes the building steel structure manufacturing factory of China Construction Steel Structure Guangdong Co., Ltd. as the research object and deeply explores its management practice of intelligent upgrading. The traditional discrete intelligent manufacturing model of steel structures has many problems, such as low production efficiency, insufficient flexibility of the production line, and backward manufacturing technology. To address these issues, the factory has innovated in multiple key processes. In terms of equipment upgrading, a high-power laser cutting machine is introduced in the blanking process, significantly improving cutting quality and speed; advanced 3D visual recognition technology and cutting robots are adopted in the bevel cutting process, enhancing precision and efficiency; the welding process is optimized with laser rust removal and the application of new technologies to expand the use of welding robots; the grinding process utilizes large-format laser rust removal equipment to improve the rust removal effect of small steel structure components; at the same time, the processes of steel structure turning and transportation are optimized to ensure safety and improve efficiency. Based on the standardized intelligent units of each process, the factory actively constructs intelligent production lines, including intelligent H-shaped steel production lines and intelligent box-shaped production lines, realizing the interconnection and interoperability of equipment and integrated analysis of data, optimizing resource allocation and quality control. In addition, the factory uses technologies such as industrial PON networks to build intelligent manufacturing systems and big data platforms, improving the digital management level. Through these intelligent upgrading measures, the production capacity of the factory's equipment is fully released, the manufacturing efficiency and product quality of steel structures are improved, costs are reduced, benefits are increased, and the employee structure is optimized. This practice not only provides valuable experience for the steel structure industry but also has important reference value for the transformation and upgrading of the entire discrete manufacturing industry in dealing with complex order production modes, helping enterprises closely follow the development trend of intelligent manufacturing and enhance market competitiveness.