The experimental demonstration of polarization-independent reflection structure that consists of two magneto-optical crystals and two mirrors is reported. According to the characteristics of polarization compensation, the reflection structure was simplified in this paper. A single magneto-optical crystal and two mirrors reflection structure is presented to simplify the polarization-independent reflection structure. The experiment shows that the degrees of polarization maintenance of the two reflection structures are both higher than 99.97%. By way of contrast, the polarization states of 90° reflection laser of single mirror and two mirrors are measured. Under these conditions, the degrees of polarization maintenance of mirrors are 92.1% and 76.2%, respectively.