Abstract: To better study the performance of rotating shavers’ sharpness, the fracture morphologies of nylon artificial hairs cut by rotating shavers were observed by stereo microscope (SM) and scanning electron microscope (SEM), and the relationship among fracture morphology and curling length of the nylon artificial hairs and sharpness of the rotating shavers was discussed. The results show that there were I, II, III, three regions in the fracture surface of nylon artificial hairs. Region I showed layered “step” morphology, region II showed morphology of grain extensions towards a certain direction, region III showed morphology of “crimp” and the eventual tearing off, and a transitional area between region I and region II showed morphology of a “fold” plastic deformation zone. The characteristic morphology of different regions was closely related to the curling length of nylon artificial hairs cut by rotating shavers. The larger the area of “step” morphology of region I and the wider the “fold” plastic deformation zone of transitional area were, the longer the curling length of nylon artificial hairs was, so that the poorer the sharpness of the rotating shavers were, and vice versa.