At present, there are many kinds of composite damage self-repair methods, including non-intrinsic self-repair methods such as thermoplastic materials, microcapsules, hollow fibers, blood vessels, nanofibers and carbon nanotubes. However, none of these self-repairing methods can realize the occurrence of perceptual damage. Therefore, this paper proposes a bionic fiber, which has the functions of sensing and repairing damage simultaneously. In the process of developing bionic fiber, we choose quartz glass as the cladding material of bionic fiber, the light curing agent as the fiber core, and the plastic fiber with matching diameters as the light window to close the two ends of bionic fiber. We carried out experimental research on the fiber. Firstly, the micro-load for bionic fiber is carried out to study its micro-bending characteristics. And, the bionic fiber is damaged (micro-crack) by adding load, and the self-repair efficiency of the biomimetic fiber is studied by comparing the output optical power of the biomimetic fiber before and after the damage. Experimental results show that the bionic fiber has certain sensing and self-repairing functions, and its repair efficiency is about 40%, and the repair rate is fast. In order to make up for the large loss of bionic fiber, short bionic optical fiber can be used as the repair element in practical application, and the plastic optical fiber can be used to close the Windows at both ends and the bionic optical fiber part to form the sensing element. Therefore, the proposal of bionic fiber in this paper provides a new way and method for the application of composite material health monitoring and damage self-repair, and also provides an experimental basis for the application research of bionic fiber in intelligent composite material structure.