Programmable logic controller, abbreviated as PLC, is a rapidly developing industrial control device in recent years, which has been widely used in various fields of industrial enterprises. With the continuous improvement of people's living standards and the rapid development of science and technology, people pay more attention to automated and humanized products. Automatic doors are optomechanical and electro-mechanical products in building equipment. They give people a friendly and generous feeling, while creating a luxurious atmosphere. Its new concept, spacious, open door and high-style design, can Be called the finishing touch of the building, because PLC control has high reliability, stability, convenient maintenance and other advantages, therefore, many manufacturers of automatic doors are using PLC to do the door control, controller, this paper is about the design of automatic door control system, the automatic door system is mainly composed of programmable logic controller (PLC) , inductor, driving device and transmission device. In order to enhance the reliability of automatic gate operation, an automatic gate control system based on S7 ~ 200 Programmable logic controller (Pi) is proposed. This paper analyzes the automatic door control system, the design requirements of the system, introduces the hardware design of the automatic door, PLC selection, driver selection, sensor selection, system software design, PLC ladder diagram design, software design, program debugging, hardware wiring and other aspects.