The invention is applicable to the field of communication technology and provides a visualization method, system and terminal device of intelligent substation. The method comprises: Obtaining the SCDtotal station system configuration file of the intelligent substation, obtaining A list of intelligent device of an intelligent substation and a virtual connection list used for characterizing an association relationship between each intelligent device according to an SCD total station system configuration file, selecting a protection device for an intelligent substation from the list of intelligent devices, and obtaining an associated intelligent device associated with the selected protection device according to the virtual connection list, taking the selected protection device as the centernode, and the associated smart device associated with it as a secondary node, topologically generating local protection graphics, and combining the corresponding local protection graphics of differentprotection devices to generate configuration graphics of intelligent substation secondary circuit so as to realize the visual display of intelligent substation secondary equipment, and enabling usersto understand the virtual connection relationship between the devices more clearly and intuitively.