The invention relates to beta-hydroxy phosphate and an asymmetric synthesis method thereof. A beta-hydroxy phosphate compound with high enantioselectivity is obtained by using beta-carbonyl phosphateas a raw material, using trifluoroethanol and water as solvents, using sodium formate as a hydrogen source and using a complex of single-sulfonyl chiral diamine and metals of ruthenium, rhodium and iridium through asymmetry transfer hydrogenation; the reaction condition is mild; the asymmetric synthesis method is simple and convenient to operate; raw materials are easy to obtain, the application range of a substrate is wide, and enantioselectivity is high. The used chiral diamine ligand, compared to a chiral phosphine ligand, is stable, simple to synthesize and relatively low in price, and iswidely applied to the asymmetry transfer hydrogenation reaction.