||If the materials are damaged, it's necessary to replace some parts or to repair the damage by gluing or welding. However, these conventional repairing methods cannot restore original form and prevent the further deterioration in performance. The self-healing materials have attracted lots of attention as a substitute to self-repair the damage. We synthesized cinnamoyl functionalized monomers having two or more functional groups. it can be polymerized (or crosslinked) when photoirradiation was carried out. However, because of the shallow penetration depth of ultraviolet radiation in the monomer, thick monomer coat cannot be completely polymerized and it has important implications for decline of physical properties. In this study, polymer was obtained by size control to make fully polymerized nanoparticle without residual monomers. Crack healing effect of polymer film was demonstrated by FT-IR spectroscopy and UV-vis spectroscopy. it was successfully demonstrated by anticorrosion test.