TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The crystal type of aluminum oxide is theta , alpha , or the mixed crystal type.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The catalyst forms organic macromolecular metal complex by palladium, silver, and organic macromolecule and obtains palladium-silver-macromolecular/aluminum oxide precursor. The precursor is roasted at 380-550 degrees C for 2-6 hours. The complexing agent can perform the functional reaction with the side chain radical group of organic macromolecule and complex the complexing agent of ion of palladium and silver after performing the reaction. The organic macromolecule is loaded to the catalyst carrier. The functional group is grafted to the loaded macromolecule chain via the complexing agent. The organic macromolecule may be grafted and functionalized via the complexing agent, and loaded to the catalyst carrier. It is dissolved in organic solvent to form macromolecule solution. The carrier is dipped in the solution. The organic macromolecule is deposited on the aluminum oxide surface and dried. The complexing agent with the functional radical group is added to backflow for 0.5-300 minutes to obtain the functional-macromolecule/aluminum oxide precursor. The pH value is adjusted to 1-4 via using inorganic acid. The prepared palladium-silver solution is added on the precursor and dipped at 20-35 degrees C for 5-30 minutes. After washing and drying, palladium-silver-macromolecule/aluminum oxide precursor is obtained. The precursor is roasted for 2-6 hours at 380-550 degrees C to obtain palladium-silver-macromolecule/aluminum oxide catalyst. The mol number of the functional group on the macromolecular chain after functionalizing/(palladium+silver) mol number is 100-1. The mol number of complexing agent/mol number of reactive radical group mol number in the macromolecule is 100-1. The complexing gent mol number/(palladium+silver) mol number is 10000-1.The catalyst is obtained by grafting the organic macromolecule to the functional group via a complexing agent and loading to the catalyst carrier, preparing solution of palladium-silver, dipping the loaded functional-macromolecular/aluminum oxide precursor to the prepared palladium-silver solution to react, complexing the palladium and silver to the functional macromolecular chain, forming the organic macromolecular metal complex by the palladium, silver and the organic macromolecule, and roasting the palladium-silver-macromolecule/aluminum oxide precursor at 382-550 degrees C for 2-6 hours.Preferred Component: The functional group included in the complexing agent is amino or diamino. The side chain of the organic macromolecule contains a radical group reacted with the complexing agent. The radical group included in the side chain of the organic macromolecule and reacted with the complexing agent is halogen and/or cyano group radical group.