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A study was in order to investigate the thermo-mechanical coupling of the end milling cutter during the high speed end milling and search for the failure mechanism,based on reverse engineering,the geometric model of the end milling cutter and workpiece was established.To simulate the end-mill cutting,a 3D thermo-mechanical coupling model was proposed using ABAQUS.Through the thermo-mechanical coupling analysis,it was found that the temperature of the milling cutter was gradually decreased around the tip,and the maximum temperature of the tip was about 904℃.The biggest error of the temperature is 12.3%.The simulation results were closer to actual process with the thermo-mechanical coupling analysis method.And the validity of the model was verified through experiments.