The poor extinction ratio and polarization cross talk of a general polarizing beam splitter (PBS) promote us to propose a high-precision polarizing beam splitting system, which consists of a PBS and polarizers. The additional polarizers are insert into reflection channel and transmission channel of the PBS, and the transmission axis direction of polarizer is adjusted, which can minimize the polarization cross talk. Both the theoretical calculation and numerical simulation demonstrate that this polarizing beam splitting system can achieve polarization splitting with higher accuracy. The experimental results show that when the intensity ratio of incident light is -47.5 dB, the polarizing beam splitting error caused by a general PBS is 57.3%, while it is 14.3% after adding polarizer. When the intensity ratio of incident light is 47.8 dB, the polarizing beam splitting error caused by a general PBS is 15.5%, while it is 8.6% after adding polarizer. The proposed polarizing beam splitter system is simple and practical, which can be employed in many polarized optical systems.