Camphorsulfonic acid is prepared from camphor through sulfonation reaction, and can be used as a pharmaceutical intermediate and an optically active body resolving agent for amino acid drugs. Sodium camphorsulfonate is a veterinary central stimulant and can also be used as a respiratory stimulant. Optically active L-Camphorsulfonic acid and D-camphorsulfonic acid are an important chiral isomer drug resolution agent, currently only the D-isomer can be obtained from natural camphor through bromination sulfonation, while L-camphorsulfonic acid must be synthesized Mixture obtained by chemical resolution.