Abstract: Petrochemical enterprises have high requirements for the continuous reliability of power supply, it is very necessary to carry out the research and construction of digitalization and intelligence of the general step-down substation in petrochemical enterprises. This paper first analyzes the current situation of the integrated automation system of the general step-down substation in petrochemical enterprises. On the basis of in-depth digital and intelligent research of new power system, we put forward the design concept of the intelligent integrated automation system of the general step-down substation in petrochemical enterprises and analyze the architecture of the integrated system. With primary equipment intelligence, secondary equipment networking, equipment status visualization, the whole station information digitalization, information sharing standardization, system function integration, advanced application practical, auxiliary monitoring and control integration, operation and maintenance management wisdom as the construction goal, we study the technical characteristics of a new generation of integrated automation systems. It is expected to provide a feasible scheme for the intelligent construction of the substation in petrochemical enterprises.