From the standpoint of historical (macro) sociology, the article examines the main directions of transformation of the sources of power identified by the English scientist M. Mann in the realities of post-modern society. The essential characteristics of the four sources of social power, which include ideology, military forces, economics and political characteristics of the organization of states, are considered. The vectors of transformations of these sources of power, contributing to changes in the image of power at the present time, are noted. The interdependence of transformations and the specificity of their manifestation at the institutional level in the political and legal sphere of public life are shown.