Selective hydrogenation reaction of cinnamaldehyde is crucial for its appliction in fine chemical industries. The traditional noble metal catalyst for this reaction is expensive and often involving tedious steps. In this work, the magnetic anchored CoPt/Fe3O4 catalyst is prepared by a simple wet-impregnation method and evaluted as catalyst for selective hydrogenation of cinnamaldehyde. Electrons transfer directly from Co to Pt NPs can enhance H-2 dissociation capability in the Co NPs interface, thereby strengthen the overall catalytic performance. Under optimum conditions, the conversion of cinnamaldehyde is 95% with 84% selectivity of cinnamyl alcohol. Furthermore, the magnetic interaction between the outer Co NPs and the Fe3O4 support maintains the stability of cinnamyl alcohol selectivity after repeated tests. [GRAPHICS] .