Objective: to know the work process and mental health care flow in Primary Health Care from the perspective of Family Health Strategy professionals. Method: a descriptive and qualitative study developed in six of the 34 Basic Health Units in a city in northwestern Paraná. Twenty-nine Family Health Strategy professionals participated in the study. Data were collected from February to June 2018 through an open, single, individual and recorded interview. The statements were transcribed in full, and the resulting material was organized in the IRaMuTeQ® software and subjected to thematic content analysis. Results: from participants’ reports, it was possible to create a service flowchart, and after the data processing steps in the software, together with content analysis, three categories emerged. The importance of community health workers’ work, family presence, referring patients to therapeutic groups and a specialized network, assistance provided to individuals in times of acute disorder and patient referral to the unit stood out. Conclusion: it can be understood that the mental health care network in Primary Health Care is complex and there is a need for communicability between services, as disarticulation generates ambiguities in continuity of care.