The invention relates to a power distribution network load modeling method, comprising the following steps: 1) determining the average electric characteristics of various typical loads; 2) making statistics about the proportions of the various typical loads in the power grid forms; 3) estimating the average characteristics of the loads in the power grid forms; and 4) according to the proportions of the typical loads and the average characteristics of the loads, establishing a power distribution network load model. According to the invention, the differences of the power distribution network loads in different development forms are considered, and through the statistical method, a power distribution network load model is established so as to provide a reasonable basis for selecting a typical daily load curve to represent the loads of the full-time cycle.