P-methylphenylacetic acid is a kind of phenylacetic acid compound. Phenylacetic acid compound is an important fine chemical intermediate, which is widely used in medicine, pesticide, perfume, dye and other fields. In terms of fine chemicals, acids with different substituents are important substrates for chemical experiments, that is, important intermediates for the synthesis of esters and amides, and important substrates for reduction to alcohols and aldehydes.