The invention relates to a diazo naphthoquinone photosensitive material intermediate and a preparation method thereof. The invention relates to the technical field of photosensitive materials. The invention aims at solving the problems of poor photosensitivity and complicated process operation in the prior art, and provides the diazo naphthoquinone photosensitive material intermediate and the preparation method thereof. According to the method, with the presence of an alkaline catalyst, a compound tris-(benzenediol)-methane represented by a formula III is subjected to a sulfonylation reaction with 2-diazo-1-naphthol -5-sulfonyl chloride, such that a corresponding compound PAC-SMS-TM represented by a formula I is produced. According to the method, OR group is introduced into the hydroxyl group of multi-branch phenol, namely a diazonaphthoquinone sulfonyl group is introduced, such that a novel photosensitive material intermediate is synthesized. The photosensitive material intermediate has a good photosensitive effect and good photosensitivity. With the method, the reaction can be fully carried out with a one-pot method, such that the method has the advantages of simple process and easy operation.