The invention discloses an intelligent decision making aiding method and system for transfer power supply. The method comprises steps as follows: performing failure analysis on other power supply lines to determine pre-failure power failure equipment when overhauling power equipment; calculating and comparing topological states of each piece of equipment before and after cutting off of the pre-failure power failure equipment, and acquiring affected load information; acquiring a transfer power supply point and an optimal transfer power supply path according to the affected load information, and generating a transfer power supply strategy. The transfer power supply strategy meeting the power grid running requirement can be generated quickly and accurately in case a power grid in the overhaul state has severe failures such as N-2 failures and the like, large-area power failure in the transfer power supply strategy selection process is avoided, and safe, stable and economical running of the power grid is guaranteed.