Abstract: To address the problems of poor surface quality of laser cladding additive remanufactured Fe45 alloy, the laser cladding layer can not meet the function and assembly requirements of precision machinery parts.The influence of the milling process on milling force, surface roughness and micromorphologies were studied.The milling subtractive test was carried out by orthogonal test method.The effects of spindle speed (S), feed speed (F) and cutting depth (a_p) on milling force and surface roughness of additive parts were evaluated by variance and range analysis.The influence of milling subtractive process on surface morphology and chip is analyzed from the microscopic point of view.The results show that the milling parameters have a great influence on the surface quality, and the most significant effect on the milling force is the milling depth, and the most significant effect on the surface roughness is the feed speed.The surface roughness Ra of Fe45 laser additive can be reduced from 13.68 μm to 1.7 μm after milling, which is 87.6% lower. From the experiment, it can be seen that the milling reduction process can significantly improve the surface quality of laser cladding additive remanufacturing Fe45 alloy, which has guiding significance for the mechanical processing of laser cladding coatings.