Aiming at the generation mode of quantum entanglement, three kinds of common preparation methods of quantum entanglement sources are introduced emphatically, including the preparation of quantum entanglement sources based on spontaneous parametric down conversion(SPDC), four wave mixing(FWM) effect and quantum dot. The principle, advantages, disadvantages and quality indexes of quantum entanglement source are analyzed respectively. Finally, the research and application direction of preparation methods of quantum entanglement source are prospected.