The invention relates to a distribution network power supply area division method based on clustering analysis. The method comprises the following steps: first, a power supply area to be divided is selected, the status of the power supply area and main factors influencing power supply area division are analyzed and an evaluation index system for power supply area division is established; then, distribution of status indexes and planning indexes of the power supply area is analyzed and an appropriate method is chosen to process data to enable the processed data to basically obey normal distribution; next, SAS software is adopted and an appropriate method is selected to make a clustering analysis on sample data of each index respectively or make a clustering analysis on a plurality of indexes to enable a clustering result to basically obey normal distribution; and finally, a division criterion for the power supply area is established according to a clustering analysis result. The method has high adaptability, can be applicable to division of power supply areas of different scales in different areas and can lay a foundation for formulation of differentiated distribution network planning design technology guide rules and related technical standards.