An embodiment of the invention provides an adaptive backup protected area fusion method for intelligent substations. The method mainly comprises the following steps: building the topology relationship between vertex equipment and branch equipment and the topology relationship between different vertex equipment in an intelligent substation according to the topology of the intelligent substation; and when detecting a branch equipment fault in the intelligent substation, acquiring an adaptive backup protected area corresponding to the faulty branch equipment according to the topology relationship between the vertex equipment and the branch equipment and the topology relationship between different vertex equipment. According to the adaptive backup protected area fusion method for intelligent substations in the embodiment of the invention, by use of the topology of digital substation backup protection, when a branch circuit breaker fault occurs to an intelligent substation or an adjacent area thereof, a fusion area corresponding to the faulty branch can be determined accurately, and an adaptive backup protection scheme for the fusion area can be acquired effectively.