The invention discloses a power grid dynamic partitioning strategy optimized search method, and belongs to the technical field of power systems and automation thereof. The maximum dynamic partitioning operand is determined according to the overload safety margin and the node voltage safety margin of equipment under an expected fault, and whether equipment overload and voltage over-limit under the expected fault can be solved after implementation of each dynamic partitioning strategy of which the comprehensive control performance meets the requirements is checked under the constraint of the maximum operand. If the problem can be solved, an optimal dynamic partitioning operation combination is chosen. If the problem cannot be solved, the dynamic partitioning strategy with highest comprehensive control performance is chosen to solve equipment overload and voltage over-limit under the expected fault with the aid of other control measures. An optimized dynamic partitioning strategy can be provided for equipment overload and voltage over-limit or other emergency in a power grid, so that configuration of emergency load shedding measures is reduced, the electric safety accident liability risk is reduced, and the level of power grid operation management is improved.