The invention relates to a rationality assessment method for a power system scheduling strategy. The rationality assessment method comprises acquiring section tidal data of a power system at a time from an EMS (energy management system) of a scheduling center; determining an objective function and establishing a multi-objective optimal scheduling model; adding a single objective function constraint on the multi-objective optimal scheduling model; calculating a value satisfying the single objective function constraint, and generating an optimal scheduling strategy; and comparing the optimal scheduling strategy and an actual scheduling operation scheme and completing rationality assessment. The invention is capable of combining assessment objectives of different types and assessing the rationality of the grid scheduling strategy from different angles; is wide in range of applications and highly practical; and assists a scheduling operation management department in finding out weak links affecting the grid scheduling operation level and in doing targeted research on possible improvement measures to improve the scheduling management level.