A distribution network distributed power supply planning model based on vector ordinal optimization includes a rough evaluation model, an accurate evaluation model, a sorting and stratifying model andan optimal tradeoff scheme selection model. The rough evaluation model is used for preliminarily evaluating all feasible solutions in a representation set. The accurate evaluation model is used for accurately evaluating all feasible solutions in a selected set. The rough evaluation model and the accurate evaluation model take the voltage quality and the investment cost of distributed power supplies as an objective function, and the constraints include a total power conservation constraint, a node voltage constraint and a DG permeability constraint. The sorting and stratifying model is used for sorting and stratifying the representation set according to the rough evaluation value and sorting and stratifying the selected set according to the accurate evaluation value. The optimal tradeoff scheme selection model is used for selecting an optimal tradeoff scheme from a truly good enough solution set. The design not only has high accuracy, practicality and effectiveness, but also can effectively improve the voltage quality.