Based on the Faraday magneto-optical effect, 2D optical imaging of magnetic field of the permanent magnets is carried out using an applicable optical system with the ZF6 glass as the magneto-optic medium. Original pictures are acquired using a self-programmed software, and processed using a self-programmed image processing software, thus polarization analysis is completed. The permanent magnet field distribution images are obtained under the transmission imaging and the reflection imaging respectively. These images reflect the actual magnetic field distribution. This experiment provides an effective means for observation and measurement of macroscopic magnetic field.