A method for refining pyromellitic dianhydride via solvent belongs to the preparation technical field of pyromellitic dianhydride, which comprises adding crude pyromellitic dianhydride, dehydrating agent and decolorant into a reaction vessel, heating, mixing and reacting, after the reaction, filtering immediately, cooling and crystallizing the filtered liquor in a crystallization vessel, filtering the crystallized materials to separate and remove crystallization mother liquor to obtain pyromellitic dianhydride crystal containing mother liquor, drying and cooling to obtain refined final product of pyromellitic dianhydride, wherein the crystallization mother liquor removed by filtering is circulated. The invention has the advantages that the invention can improve yield of PMDA, save dehydrating agent and decolorant, save energy and reduce energy consumption, the product PMDA has high purity, the organic impurties in product as trimellitic anhydride, pyromellitic acid dianhydride, pyromellitic acid dianhydride monoanhydride and pentamethyl anhydride are reduced, thereby reaching the purity demand for polymerizing electronic grade polyimide film.