The invention relates to a whole-network real-time model sharing method and system for multi-level scheduling. The method comprises the steps of obtaining a calculation bus set, an alternating currentbranch set, a converter set, a direct current branch set and a connection line set of a scheduling system; determining a local node branch calculation model of the scheduling system according to thecalculation bus set, the alternating current branch set, the converter set and the direct current branch set of the scheduling system; determining a whole network integrated node branch calculation model according to the local node branch calculation model and the tie line set of each scheduling system; returning the packaged whole-network integrated node branch calculation model to each scheduling system; The technical scheme of the invention is based on a calculation bus. The node branch calculation models of the alternating current branch, the converter and the direct current branch realizewhole network model sharing, and the problems that reverse sharing of an existing scheduling system and method is not easy to realize, the online analysis real-time calculation requirement is difficult to meet, the analysis application calculation precision is low, and regional model data is asynchronous or delayed are solved.