In order to more comprehensively know and understand the physical properties of the metal Ag, its magneto-optical characteristics are investigated. By using light tunneling mechanism, we study the transmission and magneto-optical Faraday rotation effect of a thick metal Ag sandwiched between two dielectric photonic crystals. The results show that the transmission and magneto-optical Faraday rotation effect of a thick metal Ag can be enhanced, owing to the localized electromagnetic field at the interface between the metal Ag and photonic crystal.