The invention belongs to the technical field of fine chemistry, and relates to a production method of 3-methyl-4-nitrobenzoate trichloronitrile butyl ester. The production method comprises following steps: (1), cuprous chloride is taken as a catalyst, trichloroacetaldehyde and acrylonitrile are reacted at 65 to 95 DEG C to prepare 2, 4, 4-trichloro-4-formaldehyde butyronitrile; (2), formaldehyde,calcium hydrate, and 2, 4, 4-trichloro-4-formaldehyde butyronitrile are reacted at 30 to 70 DEG C so as to prepare 2, 4, 4-trichlorocyanbutanol; (3), 3-methyl-4 nitrobenzoic acid, pyridine, and thionyl chloride are reacted at 30 to 120 DEG C to prepare 3-methyl-4-nitro benzoyl chloride; and (4), 2, 4, 4-trichlorocyanbutanol and 3-methyl-4-nitro benzoyl chloride are reacted at 30 to 50 DEG C so asto obtain a finished product. The production method is capable of increasing the entire reaction yield, and reducing production cost; and is suitable for industrialized production.