The invention relates to a reactive comprehensive control method based on an improved five-zone diagram. The method comprises the following steps: (1) the boundary of the improved five-zone diagram is defined based on a dynamic reactive compensation device, so that a variation range of the boundary of the improved five-zone diagram is obtained; (2) according to known five-zone diagram boundary conditions and the variation range of the boundary of the improved five-zone diagram, a schematic diagram of the improved five-zone diagram is obtained, and then a new regional part based on a continuous variation range of the dynamic reactive compensation device is obtained; (3) on the basis of the obtained improved five-zone diagram, the reactive comprehensive control method of the novel five-zone diagram is obtained. The reactive comprehensive control method effectively avoids the shortcoming that a control sequence is disordered sometimes, thereby being a safe and reliable control method for comprehensive reactive control over an intelligent substation and other kinds of equipment. Besides, the reactive comprehensive control method can cope with the characteristic that an electric power system reactively and frequently changes at present, as a result, the dynamic reactive compensation device is utilized more effectively, and a more accurate control effect is achieved.