In modern conditions of the development of society, which is characterized by the exponential development of high technologies that penetrate into all spheres of public life, in a period when the problem of regulating biotechnology, smart cities, all-encompassing digitalization is acute, and all this against the backdrop of the Covid-19 pandemic requires a solution to the issue about fundamental legal values that are necessary for the optimal mediation of social communication in unprecedented circumstances. The aim of the research is to consider the category of "fundamental legal value" and its role in the regulation of legal relations. The object of this research is social relations arising in the process of legal regulation. The subject is fundamental legal values as necessary tools for legal mediation of social communication. The study used dialectical, logical, systemic and structural, functional, formal legal methods. In this study, based on the analysis of modern legal literature, it is concluded that the category "fundamental legal values" is not sufficiently studied and requires further research, while it is necessary to differentiate the value foundations of law and fundamental legal values, where the former are decisive for the latter. The axiological aspect in the study of law is in demand in view of the crisis in the regulation of public relations through law, since in modern conditions of disorientation of society, lockdowns and restrictions, it is necessary to preserve and develop the value orientations of legal regulation, which is possible only through the use of legal instruments, which are fundamental legal values.