With the continuous improvement of China's science and technology and economic development level, automatic control runs through all walks of life in China, and the Industry 4.0 era dominated by Internet of Things and intelligent manufacturing has gradually matured. Therefore, according to the changing market requirements, automatic control requirements have become higher and higher, and it is more and more common to integrate automatic control technology in the field of microelectronics. With the use of microelectronic technology, electrical control can be carried out more accurately, and the volume of equipment can be reduced, thus serving the future development of automatic control field. This paper analyzes the key technology of microelectronics.