Abstract: In order to improve the phenomenon of chip accumulation during the processing of arc edge chamfered PCD turning tools, reduce tool wear during processing, and improve their processing performance, a secondary chamfering treatment is carried out on the basis of arc edge chamfered turning tools to form a composite chamfering structure. In CATIA software, based on the actual process of grinding PCD chamfered cutting tools using the grinding machine CORBENR RG9, a three-dimensional model of the cylindrical back face composite chamfered turning tool is established. Then, the Deform V11.0 software is used for 3D cutting simulation analysis of the PCD composite chamfered turning tool.And based on the simulation analysis results, a comparative analysis was conducted on the cutting experiments of PCD composite chamfer turning tool and PCD first-order chamfer turning tool.The results show that when the cutting depth is smaller than the first order chamfer width, the second order chamfer width should be greater than the cutting depth; When the cutting depth is close to the first order chamfer width, the second order chamfer width should be smaller than the cutting depth. When the cutting depth is small and does not exceed the second order chamfer area, choose a larger second order chamfer angle; When the cutting depth is large, choose a smaller second order chamfer angle.At the same cutting depth, the cutting temperature of PCD composite chamfer turning tool is lower than that of PCD first-order chamfer turning tool. When the cutting depth is 0.14mm, as the cutting time increases, the surface roughness of the parts processed with PCD composite chamfered turning tools is smaller than that of PCD first order chamfered turning tools; Comparing the tool wear morphology after 30 minutes of processing, it was found that the PCD composite chamfered turning tool had less wear.