The invention relates to a power system geographical wiring diagram background map generation method based on SVG (Scalable Vector Graphics), comprising the following steps: separating place name text annotations and other graphic data in a background map to get two pieces of SVG data; reading the two pieces of SVG data into a memory; calculating out text transformation matrixes after scaling according to the current scaling ratio of the geographical wiring diagram of a power system, and modifying the text transformation matrix in the place name text annotation SVG data; overlapping and merging the place name text annotation data and the separated other graphic data in the background map after modification to form new geographical wiring diagram background map SVG data; and drawing a background map in the geographical wiring diagram system with use of the new background map SVG data according to the current size of the geographical wiring diagram. Through the technical scheme provided by the invention, the problem that the place name text annotations in the background map and electronic component graphics drawn on the background map are inconsistent after overlap in the scaling process of the geographical wiring diagram of the power system is solved.