The invention discloses a distribution network power supply capacity evaluation method, and relates to the field of power supply monitoring and evaluation. The distribution network power supply capacity evaluation method comprises the steps of selecting a plurality of power supply capacity basic indexes, wherein the power supply capacity basic indexes are used for measuring the power supply capacity of a power grid; setting a power supply capacity basic index weight which is used for reflecting the relative importance degree of the power supply capacity basic indexes in distribution network power supply capacity evaluation; determining a distribution network power supply capacity evaluation criterion, and judging whether the power supply capacity basic indexes meet the distribution networkpower supply capacity evaluation criterion or not. The distribution network power supply capacity evaluation method provided by the invention not only can perform assessment on operating conditions of a distribution network, but also can find out weak links in the operation of the power grid and formulate loss reducing and energy saving measures, thereby providing a reliable and detailed theoretical basis for distribution network planning and transformation, and having important theoretical and realistic significance for improving economic and social benefits of electric power enterprises.