The polarization splitter prism is made of multilayer film structure plated on the inclined surface of the rectangular prism, and then glued into a cube structure. By taking advantage of the property that the transmittance of P polarized light is 1 and that of S polarized light is less than 1 when the light incident at Brewster Angle, the P polarized component can be completely penetrated after the light passes through the multilayer film structure at Brewster Angle for many times. And the vast majority of the S-polarized component reflects (at least 90% above) an optical element.