This paper aims to design an effective mental health course for college students. Based on network sharing platform and social psychology theory, the author defined the key elements of course design, namely, organizational management, teaching content, platform construction, teachers and students. Then, the evaluation indices for teaching effect were determined according to the design elements. Finally, the teaching effect and degree of satisfaction of the designed course were evaluated through questionnaire survey and classroom teaching. The results show that the design philosophy is in line with the modern rules of mental health education for college students; the designed course improved the teaching effect of the test group by 26.5-31.4% through 6-10 months of classroom teaching; the course satisfaction index was 4.02, indicating that the course achieved most of the expected effects. The research findings provide new insights into the design and evaluation of mental health course for college students.