The case teaching method mainly refers to the case-based teaching method. This teaching mode can help students master the abstract theory. Teachers and students can also interact and communicate effectively in the teaching process to motivate students to learn. The article briefly summarizes the basic concepts of case teaching method, and discusses the specific application of case teaching method in mental health teaching, including the two stages of pre-course preparation and classroom implementation in mental health education. Pre-class preparation includes selection of cases, courseware production, formation of discussion groups and familiarization of cases; classroom implementation includes presentation of cases, organization of discussions and summary of conclusions.