The invention discloses a fast topology analysis method based on a general information model. The fast topology analysis method based on the general information model includes the steps that according to the definition of power supply points, the power supply points in an electric power network graph are acquired and set as root nodes in the tree topology; then, according to IDs of devices, connection nodes of the current node are acquired; according to the connection nodes, whether connection devices exist or not is judged; all the other obtained connected devices are constructed as child nodes of the ancestor nodes; finally, according to the connection nodes, whether the connection devices exist or not is judged. Through the method, the relations between the node devices are fully recorded, and the shortest path between every two node devices can be acquired fast and effectively in a depth-first mode; power supply paths from the power supply points to turned-off switches and all child node devices of the turned-off switches can be fast acquired in combination with the current power grid operation model, the accurate and effective power failure range is worked out, and all the requirements of advanced application of a smart power grid for power grid topology analysis are met.