The invention relates to a power grid distribution reactive power optimization method, so as to solve defects in the prior art. The method in the technical scheme comprises the following steps: A, basic parameters of a target power grid are acquired; B, a power grid distribution reactive power compensation node and a distribution network reconfiguration branch are read; C, an optimization objective function of the target power grid is determined; and D, a power grid distribution reactive power compensation node is selected and a shuffled frog leaping algorithm is adopted for the optimal choicefor the distribution network reconfiguration branch, and a corresponding action is executed. Two technologies of reactive power optimization and distribution network reconfiguration are integrated, adistribution network integrated optimization model with the annual integrated cost to be minimum as a target, the shuffled frog leaping algorithm is adopted for solution, the network loss can be further reduced, the node voltage can be enhanced, the economy of reactive power compensation is thoroughly considered, the distribution network integrated optimization is more in line with the economy principle, and the economic value can be thoroughly evacuated, integrated and optimized.