The transmission characteristics of linearly polarized light in one-dimensional magneto-optical photonic crystals are numerically analyzed by using the transmission matrix method. The 4×4 transmission matrix was derived, and then the transmission spectrum and Faraday rotation angle of linearly polarized light in one-dimensional magneto-optic photonic crystal are calculated numerically. The results show that the transmission spectra of left-handed and right-handed circularly polarized light propagating in one-dimensional magneto-optic photonic crystals do not coincide with each other due to the magneto-optic effect of magneto-optic materials when an external magnetic field is applied. Finally, the amplitudes and phases of the x-component and y-component of the electric field intensity of the transmitted light are calculated, the expression of the transmitted light is obtained, and the Faraday rotation angle is calculated.