Abstract: A magentic peanut shell (PSK-Fe₃O₄) composite is prepared from peanut shell modified with KMnO₄ by a co-precipitation method.Then,the composite is employed as supports to anchor palladium by a chemical reduction method.The samples are characterized by XRD、FT-IR、TEM、XPS and TG.The catalytic performance in the hydrolytic dehydrogenation of ammonia borane (NH₃BH₃,AB) is investigated in details.The results show that Pd/PSK-Fe₃O₄ catalyst exhibits good catalytic activity and the corresponding turnover frequency (TOF) reaches up to 6.7 mol_H·₂·mol_Pd^-1·min^-1 and the apparent activation energy (E_app) of the reaction is as low as 28.0 kJ mol^-1.The corresponding reaction order of the catalyst and AB concentrations are first order and zero order in the hydrolytic dehydrogenation of AB,respectively.In addition,the catalyst has a satisfactory reusability.