The purpose of this article is to bring light to main characteristic features and leading functions of political discourse. In order to achieve this purpose, we also need to focus on the cognitive analysis of political discourse, which, first of all, is based on the fact that public consciousness is more visually valuable and reflected in it. Hence, political discourse is directly connected with valuable orientations of the society. These valuable categories are often considered as semantic and cognitive structures. Here we try to analyze such issues as: a) analysis of political discourse as the most influential tool on public consciousness; b) modification of linguistic and extra-linguistic features of this discourse; c) main functions of political discourse.