In the paper, such problems as printing wrong label, wrong labeling, high labor intensity of operators and potential safety hazards due to the cross operations with crane on site aiming at the manual labeling for outer and inner surfaces of steel coils after skin rolling in the skin-pass rolling production line. The mutual communication and control of each system are completed as well as the automatic labeling with mechanical arm instead of manual work is realized through designing the electrical automation control, upper computer control, motion control of mechanical arm, clamp and pneumatic system of automatic labeling system for steel coils in the skin-pass rolling production line so that the labor intensity of operators reduces and life safety of personnel is ensured. The automatic labeling system can be as the reference for replacing the manual operation with mechanical arm under the similar conditions.