The thesis in question aimed to analyze the precariousness of the work of social workers in the SUS in the capital of Rio de Janeiro (RJ) seeking to analyze its relationship with the set of expropriations of workers rights in the context of capital crisis. Some modes of precariousness that make up this process were identified and analyzed, such as: working conditions, employment relationships, wages, among others. From these data, we sought to point out incidences in the lives of SUS workers stationed in the city of RJ between the years 2015 to 2021, in the three federative spheres, responsible for the operation of hospital units and emergency care. It is a qualitative research, with methodological strategies that involve bibliographic review and empirical research. 21 social workers were interviewed. It is concluded that, in the SUS of the city of Rio de Janeiro, there is a predominance of employment contracts with precarious ties of Social Workers, affecting the professionals in an objective and subjective way. They experience a precarious condition with emotional overload, wages incompatible with training requirements and high levels of education, excessive workload resulting from multiple work relationships to meet their needs for social reproduction. The work of social workers in the SUS in RJ, as well as other workers working in area of public health, has been characterized by the growing process of secondary expropriations of workers expressed in the withdrawal of social and labor rights. This phenomenal expression of work demonstrates the increase in the exploitation of workers as a whole, intensification of work, reduction in the cost of wages for contractors, what meets the privatist interests of public policy and devaluation of the whole workforce dependent on this essential service.