The invention relates to the field of luminescent thin film materials, in particular to a preparation method and an application of a multi-response platinum complex luminescent thin film. The preparation method of the multi-response platinum complex luminescent thin film comprises the following steps: (1), a platinum complex precursor and 2,6-dimethylphenyl isocyanide are subjected to a reaction,the platinum complex is prepared and is recrystallized in a chloroform solution, and the platinum complex is prepared; (2), the platinum complex is dissolved in a good solvent S1, and a platinum complex solution is prepared; (3), high-molecular polymers are dissolved in a good solvent S2, and a high-molecular polymer solution is prepared; (4), the platinum complex solution and the high-molecular polymer solution are mixed, and a compound solution is prepared; and (5), the compound solution is dropwise added to an evaporation dish and subjected to tape-casting to be flat, and the platinum complex luminescent thin film is prepared. The raw materials are easily available, the preparation method is simple and has a good effect, and the platinum complex luminescent thin film can be widely applied to the fields of volatile organic compound detection, thermosensitive sensing and the like.