Abstract: High-strength steel has excellent mechanical properties and wide application, but cutting is difficult, there are low processing efficiency, poor quality processing surface and other problems. In this paper, AF1410 high-strength steel as the research object, the application of high-speed milling machining methods, the use of coated carbide blades, the AF1410 high-strength steel high-speed milling experiments, research and analysis of tool wear, cutting force, cutting temperature and processed surface roughness changes in the conditions. The study found that CVD-coated tools combined with TiCN and Al₂O₃ can be adapted to long-term high-speed stable cutting of AF1410 high-strength steels, and that tool wear patterns are mainly normal wear on the flank surface; Radial force F_r is the largest, axial force F_z is second, and tangential force F_t is minimal during cutting, and as the cutting length increases, the radial force F_r and axial force F_z increase significantly and the tangential force F_t changes less; The chip temperature just cut out by the tool increases gradually, and the workpiece machined surface temperature increases less, and the roughness of the machined surface fluctuates less with the increase in cutting length.