Abstract: Unlike traditional artifact voltage standards, quantum voltage standards are linked to fundamental physical constants and thus have advantages for voltage metrology, such as high accuracy and stability. This paper reviews the discovery of the Josephson effect and the process of establishing DC quantum voltage standards, focuses on combining the basic principles, issues, as well as applications of AC quantum voltage standards, including both the programmable Josephson voltage standard and the pulse-driven Josephson voltage standard, and compares the performance and applications of these two AC quantum voltage standards. In particular, in view of the importance of accurate electric energy measurement, two AC power standards based on quantum voltage are introduced. Finally, the future development trends and application prospects of quantum voltage standards are prospected.