The invention provides a synthesis method for novel azacyclo-carbene ligand and a ruthenium carbene catalyst synthesized by the method and a norbornene polymer product obtained by catalyzing norbornene open-loop metathesis polymerization (ROMP). The ruthenium metal catalyst is simple in structure, is easy to synthesize, is high in catalysis activity, and provides a novel efficient way for preparing a norbornene material.