Preparation method of self-repairing material, self-repairing material, self-repairing film and application of self-repairing film

The invention relates to a preparation method of a self-repairing material, the self-repairing material, a self-repairing film and application of the self-repairing material, the preparation method of the self-repairing material comprises the following steps: providing a first solution containing an isocyanate monomer, and the weight percentage of the isocyanate monomer in the first solution is 75-85%; providing a second solution containing dihydric alcohol containing a heterocyclic structure, wherein the weight percentage of the dihydric alcohol containing the heterocyclic structure in the second solution is 85%-95%; the first solution and the second solution are mixed and react to obtain a high-molecular precursor, and a main chain of the high-molecular precursor contains a urethane structure and a heterocyclic structure; providing a third solution comprising a metal salt, wherein the weight percentage of the metal salt in the third solution is 20-30%; and mixing and reacting the polymer precursor with a th