The invention discloses a method of automatically creating a power supply path based on a power grid district model. The method is characterized in that a power supply district can be created automatically; a power grid topology can be searched, and a self-defined internal memory model can be built; topology searching of a power grid can be carried out, and can be started from the power supply station, and then all the lines of the power supply station can be searched, and can be processed in a circulated manner; whether the circulation is ended can be determined, and when the circulation is not ended, other devices connected with the current device can be searched, and the searched device type can be determined; when the searched device type is the line, other devices connected with the current device can be searched continuously, when the searched device type is the power supply station, the power supply path can be created according to the device searched by the topology; the power supply path can be created according to the searched device; the power supply path can be divided into a load power supply path and a small power supply path according to the power supply type; and the power supply path can be divided into a valid power supply path and an invalid power supply path according to the validity. The correct circuit power supply path can be created, and the fault calculation time and the principle level setting calculation time can be shortened.