Abstract: In recent years, power plants have undertaken more and more important production tasks. In order to maintain the efficient development of production, the integrated power plant system needs to have extremely powerful control functions. At present, people are increasingly inclined to fieldbus control technology, which has effectively changed the limitations of traditional control systems and improved the reliability of control. At the same time, its automation characteristics are obvious in many links. Based on this, this article analyzes in detail the construction of a power plant integrated automatic control system based on fieldbus.