Abstract: Objective Addressing the problem of low efficiency and insufficient precision of traditional section steel cutting processes. This paper designs an automated robotic section steel cutting production line and conducts in-depth research on its key technologies. Methods The production line employs plasma cutting technology with integrated laser cutting function, enabling multiple process functions, such as rapid cutting, drilling/marking, end-beveling and automatic spray marking of section steel. Through coordinated operation of multiple functional units, production line achieves full automation from material feeding, conveying, clamping, cutting to discharging. A laser detection system which is added performs 3D deformation detection on raw materials and automatically corrects cutting trajectories to ensure machining accuracy. The integration of 3D profile nesting software and robot parameter calibration and compensation technology further optimizes cutting paths and enhances robotic motion precision. Results Experimental results confirm that the production line meets technical requirements in both cutting efficiency and accuracy, enabling efficiently complets cutting tasks of structural steel with multiple specification, which has smooth operation and broad compatibility of structural steel. Conclusion This research provides technical support for intelligent processing of section steel in marine engineering, steel structure construction and so on, offering significant practical value.