The invention relates to an active power distribution network distribution automation terminal optimal configuration method. The method is used for realizing distribution automation terminal configuration at a section switch of a distribution network. According to the method, a genetic algorithm is adopted to solve a constructed distribution automation terminal optimal configuration mathematical model, and an optimal configuration scheme is obtained. In the genetic algorithm, chromosomes are formed based on the configuration state of the power distribution automation terminal at each section switch, one chromosome represents one configuration scheme, and the fitness value of each chromosome is obtained based on the target function in the power distribution automation terminal optimal configuration mathematical model and the power supply reliability under the configuration scheme. Compared with the prior art, the method optimizes and determines the installation type and the number of the DA terminals in the active power distribution network, considers the power supply reliability of the DA configuration to the active power distribution network, and improves the accuracy, the efficiency and the economy of the distribution automation terminal configuration.