Abstract: In recent years, with the rapid development of the power grid, the problems arising from the maintenance of substation equipment have become increasingly apparent. During the maintenance process, transformer and line CVT maintenance has been a problem for maintenance personnel due to design, construction, or equipment model reasons. Because the size of the base is different, the traditional safety belt suspension device is not fully applicable. As a result, during some equipment maintenance, it is not possible to install a seat belt suspension device and do not wear a seat belt. The safety belt is tied to the pillar insulator, and risky operations may occur from time to time; The second is that the safety belt suspension device needs to be fixed by adding multiple cushion blocks at the limit screw bolts. The device is bulky, takes a long time to install, and is unstable to install. Not only does it bring great safety hazards to on-site operators, but it also reduces the efficiency of maintenance work. Based on the above situation, a universal fixed safety belt suspension device with lightweight, simple installation, low cost, and sturdy structure has been designed for the universal installation structure of transformer bushing and line CVT.