The mental health and psychological crisis of college students has aroused the attention of all walks of life. College students are unable to cope with various pressures, and crisis situations such as suicide are not uncommon. Solving the psychological crisis of college students is urgent. The psychological crisis of college students is a major psychological imbalance that occurs when individual college students or groups believe that they cannot solve, handle, and control themselves or face unimaginable learning, work, and life events. This paper aims to study the role of psychological evaluation system based on the internet of things in the early warning of college students' psychological crises. This paper uses the SCL-90 scale method to quickly classify the mental health problems of college students.