The invention discloses a multi-version graphic difference visual display method for a power system. The method comprises the following steps of S1, configuring a primitive comparison rule library; S2, opening a compared version graphic file; S3, selecting a target version graphic file used for comparing the difference; S4, based on CIM/G language specifications, obtaining primitives and primitive attribute sets contained in the compared version graphic file and the target version graphic file, marking the sets as a set 1 and a set 2, filtering out the primitives and attributes which do not participate in comparison in the sets according to the rule library obtained in the step S1, comparing the set 1 and the set 2, and storing the primitives and the primitive attributes with the difference in a comparison result set; S5, displaying graphs which participate in comparison at the same time in main and secondary windows of a same graphic browser; and S6, viewing the primitives with the difference in sequence, and querying the specific attributes with the difference in the primitives. According to the method, the difference among the graphic files of different versions can be intuitively displayed.