The relevance of the study is due to the need for a conceptual analysis of the transformation of such a human phenomenon as conscience in the period of the XX-XXI centuries. In this regard, the purpose of this study is to determine the main features of the reflection of conscience in the public consciousness of the XX - XXI centuries and its key functional characteristics. The main scientific methods for studying the issue are basic general scientific methods of analysis, synthesis, induction, deduction, comparative, systematic, which allow a thorough approach to the presentation of the topic and create a structured picture of moral and ethical transformations. The article reveals the fundamental approaches to the interpretation of conscience in modern historiography. The results of the research can be actively used not only in modern philosophical science, as a substantiation of the main approaches to the interpretation of the actual perception of conscience, but also in related humanities to confirm historical, moral, ethical, psychological and other changes in the process of social evolution.