A method of co-producing a long chain amino acid and a dibasic acid, comprising the following steps: (a) reacting a keto acid derivative with hydroxyl amine in a solvent or performing an ammoxidation oximation reaction to generate a hydroxamic acid derivative; (b) performing a Beckmann rearrangement reaction on the produced hydroxamic acid derivative to produce a mixed amide derivative; and (c) hydrolyzing the obtained mixed amide derivative to obtain a long chain amino acid and long chain dibasic acid.
