OBJECTIVE: To analyze training and knowledge of professionals in the Family Health Team on reporting the mistreatment of children and adolescents. METHODS: Cross-sectional study carried out in three municipalities of Ceará State, Northeast Brazil, from January to April 2012. The research included 51 professionals: physicians (9), nurses (26), and dentists (16) who worked in the Family Health Strategy. A questionnaire was used for data collection, which received descriptive statistical analysis with the Pearson's chi-square test, being significant p≤0.05. RESULTS: There was a predominance of professionals who had not participated in violence against children and adolescents training (86.3%); who knew the Child and Adolescent Statute (90.2%), and how to notify mistreatment (62.7%). Most interviewees said that the health unit had the form (70.5%), and they knew where to refer victims to (82.3%). Most professionals did not have any contact with mistreatment situations (62.8%). Only 37.2% had already identified some case and, among them, 60.0% reported the occurrences. There was a significant association (p=0.035) between the act of notifying and the participation in a training on the subject. CONCLUSIONS: This study showed that the participants have difficulties in the reporting mistreatment of children and adolescents, and there are gaps in knowledge and weaknesses in training in this area.