The invention discloses a ferromagnetic/antiferromagnetic multilayer film drilling system and its preparing method, including a substrate, a buffer layer, a drilled ferromagnetic layer, a antiferromagnetic layer and a protective layer. The preparing method: depositing the three layers in turn on the substrate and vacuum-annealing so as to obtain it. It adopts CLPt as the antiferromagnetic drilling material, which has a relative great drilling effect on the ferromagnetic layer, and it is more important that it extremely improves its thermal stability and anticorrosive ability and largely reduces atomic dispersion between the ferromagnetic/antiferromagnetic layers. Its preparing process is simple and its property is stable.