The compact polarization entanglement source system(WT-QES100-B) is based on the spontaneous parametric down-conversion process of nonlinear crystals, which can realize the preparation, collection and entanglement characteristics measurement of entangled photons, ect. The system not only involves theoretical knowledge of geometrical optics, polarization optics, nonlinear optics and quantum mechanics, but also is a combination of experimental techniques and a carrier for the popularization of quantum mechanics. WT-ESS series of quantum entanglement source systems innovatively adopt a cage structure with compact structure, small volume, and easy operation.