High-voltage isolating switch is a simpler type of high-voltage switch, and its consumption is large, about 3-4 times that of circuit breakers. The function of the isolation switch is to separate or connect the electrical equipment and the high-voltage power supply when there is basically no current on the line. Because of the obvious disconnection point, it is easier to judge whether the circuit has been cut off. In order to ensure safe maintenance work, there will be a lot of work in the installation of high-voltage isolating switches. This paper discusses the problems in the installation process of the high-voltage disconnector, in order to improve the installation speed and quality of the high-voltage disconnector.