With the development of robotic haircutting systems, perception systems have become one of the critical components for achieving precise haircuts. A haircutting robot’s perception system is not only responsible for sensing the environment but also for accurately 3D modeling the head and hairstyle of the user, analyzing the texture and softness of the hair, and ensuring safety throughout the haircutting process. In this chapter, we will delve into 3D modeling techniques for the head and hairstyle, the application of computer vision in haircutting, and human safety recognition and obstacle avoidance technology.