The invention discloses a chiral imidazolinone-phenol synthesized from L-prolinamide and 3,5-di-tert-butyl salicylaldehyde (and systematically named (7aS)-3-(3,5-di-tert-butyl-2-hydroxyphenyl)-hexahydropyrrole-[1,2-e]imidazole-1-ketone). The synthesized chiral imidazolinone-phenol is used as a chiral ligand for the oxidization of sulfide into chiral sulfoxide under the catalysis of vanadiumoxy-acetylacetonate. The chiral ligand is special in structure, easy in synthesis, low in cost and good in enantioselectivity and has important application prospect.