Notch machining of fatigue specimens has always been a difficult problem to be solved urgently.A new notch cutting technology for tangential turning-milling was proposed,and the influence of tangential turning and milling on the surface morphology of V-notch was investigated by combining theory with experiment.The results show that the bottom of tangential turning-milling V-notch will show different processing texture directions under different process parameters;the angle between the texture direction and the axis of the workpiece calculated by the proposed theoretical formula has a small error with the actual result;the 3D surface roughness Ra of notch bottom decreases with the increase of milling speed nc,increases with the increase of workpiece speed nw and decreases first and then increases with the increase of feed per tooth fz;the optimum parameter combination for surface roughness is nc=6 000 r/min，nw=100 r/min，fz=0.037 5 μm，with this combination of cutting parameters,the surface roughness Ra of V-notch can reach 0.075 μm.