The invention relates to the technical field of the design of a virtual circuit of an intelligent substation, and particularly relates to an automatic connecting method for the virtual circuit of the intelligent substation. The automatic connecting method comprises the following steps: typing a typical technical scheme on a technical manual in a computer, and generating a tree circuit matching model comprising voltage class, interval, interval equipment and information flow; generating a regular expression on the bottom layer of the tree circuit matching model according to the information flow and a configuration file described by a manufacturer on a virtual terminal in the interval equipment; creating an intelligent substation secondary design software according to the project of the intelligent substation; traversing the tree circuit matching model layer by layer by utilizing the intelligent substation secondary design software, matching all the regular expressions and the virtual terminal of the intelligent substation secondary design software, and connecting the successfully matched virtual terminal. The tree circuit matching model digitized by the computer is applied to the intelligent substation secondary design software, the corresponding virtual terminal in the intelligent substation secondary design software is automatically connected according to the matching result of the regular expression, and the design efficiency of the virtual circuit is greatly improved.