The State Grid Corporation of China has always put safety in the first place in all its work. In order to adapt to the continuous improvement of the national economy and the sustainable development, it is necessary to ensure the safe of China's national power supply system and the reliability of power supply for the people. This paper takes the safety management of power field operations as the main entry point, designs sensors for managing workers in violation of regulations, servers for work apparatus and personnel safety, databases for risk warning, optimizes the system algorithm for field risk determination, and builds a power safety management system with Internet of Things technology, which, through experimental analysis, can effectively reduce field operation risks and improve power safety management. After all, safety is always the eternal theme of power grid construction and development.