Abstract: The article aims to realize the remote measurement calibration of the high voltage DC voltage divider. The traditional calibration method is to send the instrument to the higher-level verification organization or the verification personnel to the site for verification, which is time-consuming and has the risk of damage during transportation, while remote calibration can perfectly solve these problems. Based on QT, we developed the console and fieldside software, realized the communication between the software of both sides and the cloud platform through sockets, and then used the cloud platform to forward messages to realize the communication between the two sides. The Ezviz Cloud is applied to realize real-time monitoring of on-site images and voice calls to ensure the legality of calibration. The verification results show that the cloud-based remote calibration system of the high-voltage DC voltage divider can achieve the purpose of remote calibration.