L-2-Aminobutyric acid is a natural amino acid that inhibits neural information transmission in humans and is an important chemical feedstock and pharmaceutical intermediate, which has become an important chiral intermediate for a variety of chiral drugs and is widely used in drug synthesis, for example, l-2-aminobutyric acid is the main production feedstock for the synthesis of the novel antiepileptic drug levetiracetam, Is also a key chiral precursor for the synthesis of the bacteriostatic antitubercular drug ethambutol hydrochloride.