The invention relates to linear polystyrene-supported (4S)-oxazolidine-2-benzimine which has the following structural formula, wherein m:n=1:1-4, and Mw=8300-14000. In the invention, (4S)-oxazolidine-2-benzimine is supported on linear polystyrene to prepare the linear polystyrene-supported (4S)-oxazolidine-2-benzimine as a chiral auxiliary reagent to induce asymmetric reaction into homogeneous reaction, and the reaction is rapid and convenient for on-line detection. The chiral auxiliary reagent not only reserves the high yield and the high stereoselectivity of the asymmetric reaction induced by the oxazolidine-2-benzimine as the chiral auxiliary reagent to obtain a chiral compound with high optical purity, bus also realize the recycling of the (4S)-oxazolidine-2-benzimine. The synthesizedchiral compound with high optical purity is used as the precursor, the intermediate and the final product of medicines, agricultural chemicals, spices and functional materials.