With the rapid development of distributed renewable energy and the popularization of DC loads such as electric vehicles and data centers, the operation and management of AC distribution networks are confronted with challenges. DC power distribution system has a broad application prospect because of its flexible and controllable power flow, closed loop operation and various power supply modes. However, compared with the control of AC system, the control of DC distribution system is more complicated. As the only indicator to measure the active power balance of DC distribution network, the stability control of DC voltage is very important to the reliable operation of DC distribution system. Firstly, the typical topology structure and the DC voltage levels of DC distribution system is introduced. Secondly, the control technology of power electronic converter of key equipment in DC distribution network is introduced. Then, the traditional voltage control strategies of DC distribution network are sorted out, and some improved voltage control strategies of DC distribution network are deeply analyzed and summarized. Finally, it looks forward to and points out the problems that need to be paid attention to and solved in DC distribution network voltage control. Ideas and references for further research on DC voltage control in DC distribution network are provided.