Quantum dots have a series of advantages of spectrum adjustable with size, high luminous efficiency, good light, thermal and chemical stability, and good solution processability, making them have a wide range of application prospects in lighting, display and other fields and they have become a hot spot in recent years. This paper firstly introduces the types of quantum dot materials, then summarizes the three structures and preparation methods of core-shell quantum dot materials, and systematically describes their three different core-shell structures, and then systematically describes and compares the research progress of quantum dot white light-emitting diodes (QD-WLED) in recent years, focusing on the analysis of white light produced by quantum dots. Finally, it summarizes the application of QD-WLED in visible light communication, health lighting, plant lighting and photodynamic therapy, and expounds the challenges and the future development prospects of this field.