As a physical resource, the quantum entanglement source plays an important role in quantum teleportation, quantum key distribution, quantum computing and quantum imaging. WT-ESS series PPKTP high-brightness entanglement source system is a set of spontaneous parameter down-conversion process based on periodically polarized crystal PPKTP to generate high-brightness correlated photon pairs to prepare a two-photon polarization entangled state quantum optical experimental system. The system has the characteristics of high quality, high performance and high integration, and has broad application prospects in scientific research application experiments, experimental teaching, and quantum science popularization.