Aluminum alloy material has the advantages of high strength, good wear resistance, good processing performance and good welding performance, it has been more and more widely used in aerospace and automotive industries. Due to the high cutting temperature during the processing of aluminum alloy, it is easy to produce thermal deformation, tool wear and other problems, so it is important to accurately predict the cutting temperature during the high-speed cutting process.The temperature distribution characteristics of aluminum alloy cutting process was analyzed theoretically.The two-dimensional cutting and three-dimensional cutting finite element simulation processes were compared,and the factors that affected the cutting temperature were explained.