With the development of smart grid, IoT devices in the field of power control are widely used. The diversity of types, features and functions of IoT devices not only integrates detailed big data, but also challenges the real-time, compatibility and big data processing capability of system control. Therefore, this paper studies an embedded edge computing technology in the IoT system which performs nearby processing of massive intelligent electricity data to avoid the bottleneck of communication channel caused by massive data transmission, and meet the special requirements of energy management and control for quick response and accurate execution. This paper describes the proposed process of database, edge computing server and data processing, and puts forward a solution to the heterogeneity problem of IoT devices, so as to enhance the compatibility and real-time processing capability of edge data. The practice has proved that the proposed technology can not only provide a safe and fast control method, but also enable the system to have stronger power information big data acquisition ability.