The invention relates to a year-month power-cut plan combination method, which comprises the following steps: determining adjusting time constraints of power grid equipment; determining power-cut window phases of the power grid equipment; determining mutually-exclusive power-cut constraints between the power grid equipment; and constructing a year-month power-cut plan combination model on the basis of the adjusting time constraints, the power-cut window phases and the mutually-exclusive power-cut constraints of the power grid equipment. The year-month power-cut plan combination method provided by the invention can construct the year-month power-cut plan model of extra-high voltage large power grid transmission and distribution equipment on the basis of multi-constraint conditions, is suitable for making of the large power grid year-month power-cut plan with interregional AC/DC power transmission channels, and improves the intensive management capability and the safety level of the large power grid power-cut plan.