The invention relates to a power supply zone partitioning method by use of Delaunay triangulation. The power supply zone partitioning method comprises the steps of partitioning power supply zones, including consumption zones, functional zones and power supply zones, forming a specific substation group by use of Delaunay triangulation within the range of the power supply zones on the basis of the position information of substations and determining a power supply architecture, and on the basis of the load of the consumption zones, taking the maximum daily average load ratio of a medium-voltage line as a target and the power supply capability and the power supply radius of the medium-voltage line as constraint conditions, and realizing feeder optimization by optimizing the load combination of the adjacent consumption zones. The power supply zone partitioning method by use of Delaunay triangulation is suitable for the characteristics and the requirements of the power distribution networks at various levels, is targeting, applicable and operable to power distribution network plans, and can be widely applied to power supply zone partitioning.