The article considers the peculiarities of professional competencies formation in future social workers through the consideration of specific professional competencies of a social worker to perform specific operational actions in the implementation of professional activities according to the job descriptions of this profession. The author determined peculiarities of the concept of professional competence for the future social worker depending on the sphere of his/her future professional activity within the system of social assistance and social services of different groups of clients in institutions of all forms of ownership. Peculiarities of professional competence of a social worker based on educational standards in the specialty «231 – Social Work» were studied. The author analyzes the views of modern Ukrainian and foreign scientists on the issue of professional competencies of social workers. The techniques of formation of professional competence of future social workers in the specialty «231 – Social work» were offered. The peculiarities of the relevance of certain professional competencies of a social worker based on the relevant educational standards for Bachelor's and Master's degrees were specified. The structure of separate professional competencies of future social workers was detailed and differentiated. The article clarifies the specifics of different professional competencies of a social worker depending on the specifics of the work of social service and the clients on whom the direct activity of the social worker is focused. The article examines the competencies of future social workers as an integrated system of professionally significant (cognitive), motivational and personal components of a particular social worker in terms of the activities of the institution where his/her professional activity is carried out. The article outlines the relevance of the development of certain professional competencies in the activities of a practical social worker in accordance with the Ukrainian legislation and trends in modern Ukrainian society.