The present invention discloses a rapid analysis method used for a state of an electric device and based on topological computation of a distributed power grid. By utilizing a topological computation result of the distributed power grid, redundancy modeling is carried out on a boundary device of the distributed power grid and rapid analysis of the state of the device in the partial distributed power grid is realized, so that the problem in a large-scale power network that the analysis efficiency of the state of the device is low due to concentrated topology is effectively solved; meanwhile, the influence on global data by the change of a partial operation manner of the power grid is reduced through the partial topological computation of the distributed power grid, and reliable guarantees are provided for the real-timeness of a power grid system; and the rapid analysis method has a good application prospect.