The invention discloses a cyclotriphosphazene type photocuring polyurethane resin and a self-repair coating prepared therefrom. The cyclotriphosphazene type photocuring polyurethane resin is prepared by the following steps: firstly, enabling diol to react with diisocyanate; then reacting with photocuring monomer to introduce double bonds; finally reacting with cyclotriphosphazene monomer to prepare the cyclotriphosphazene type photocuring polyurethane resin; and the self-repair coating is prepared by mixing the photocuring polyurethane resin, a photoinitiator, an activated diluent and a solvent. The preparation method is simple, the reaction conditions are mild, the contained carbon-carbon double bonds can be used for photocuring performance of the coating, the hydrogen bond in isocyanate can be used for self-repair performance, the coating has better hardness and mechanical performance by introduction of a cyclotriphosphazene core, as well as self-repair performance, and the self-repair coating with excellent performances can be prepared by mutual matching of all the raw materials.