The invention discloses a metal complex as well as a preparation method, application and an intermediate thereof. A chiral diphosphine ligand or a metal complex thereof is adopted as a catalyst for an asymmetric hydrogenation reaction of pure alkyl tetra-substituted cyclic alkene amide, synthesis of a chiral cyclic amino compounds is achieved, and the chiral diphosphine ligand or the metal complex thereof is high in catalysis efficiency in the asymmetric hydrogenation reaction, high in product chiral purity and large in substrate application range.