The invention relates to an electric power system reconstruction method. The electric power system reconstruction method comprises the steps of dividing a to-be-reconstructed system into x sub systems according to a sub-system division rule, wherein x is a positive integer; a backbone channel of the sub systems is recovered by a backbone channel recovery model and a constraint condition of the sub systems; a partial power grid of the sub systems is recovered through an objective function and a constraint condition which are optimized by a partial power grid recovery path of the sub systems; and inter-system networking recovery for the sub systems is realized based on a regional networking recovery function and a constraint condition thereof. According to the electric power system reconstruction method provided by the invention, serial recovery is combined with parallel recovery while coordinate matching of the backbone channel, the partial power grid and the region networking is taken into consideration, so that the electric power system recovery speed is improved.