The invention relates to an automatic network system of an intelligent substation. The automatic network system is composed of station control level equipment, a station control level network, spacing level equipment, a process level network, and process level equipment. The station control level equipment is connected to the station control level network. Information acquisition and automation control of a remote-action system, a monitoring system, and a five-prevention system are realized by data interaction between the station control level network and the spacing level equipment. The process level network and the station control level network are independent of each other without by direct or indirect physical connection or direct data interaction. The spacing level equipment, the process level network, and the station control level network carry out data interaction; access to the station control level network is needed if any information needs to be obtained from the process level network; and the process level equipment carries out data interaction with the spacing level equipment by the process level network. According to the invention, network sharing of all service data is realized to the greatest extent, so that the cost is lowered; with isolation, a network fault risk is reduced; and the whole system has a clear structure, thereby realizing follow-up expansion and maintenance.