In article conceptual basics of application of system approach to process of formation of social and legal competence of future social workers in the conditions of university education are covered. Concepts «system» and «system approach» in the context of training of students for professional activity in the sphere of social work and, in particular, acquisition of social and legal competence by ... [Show full abstract] them as complex and personal education are analyzed. Feature of system approach consists that it opens integrity of system; allows to define the mechanisms providing integrity of system; promotes identification of communications between components and their coherences. Definition and the analysis of conceptual bases of system approach allow to develop qualitative model of system of formation of social and legal competence. In article relevance and need of system consideration of this process through the analysis of the main contradictions is proved. The structure of system of formation of social and legal competence by means of allocation of its components (target, substantial, procedural, object – subject, the social environment) and definitions of their communications is shown. It is indicated the need of system consideration of separate social and legal competences, and the accounting of integrative nature of their formation. Importance of inclusion of students in the professional directed activity providing transfer of the acquired social and legal competences in the practical plane is noted. The specified conceptual provisions of use of system approach make a scientific-theoretical basis for creation of pedagogical system of formation of social and legal competence of future social workers in the conditions of university education.