Based on the differential equation verification method, this study explores the characteristic model of mental health education activities for all employees and provides further research basis for constructing the competency characteristics for all employees in mental health education colleges. The results show that (1) the competence characteristics of all psychological teachers in mental health education colleges include interpersonal understanding and communication, respect for students, student service orientation, self-regulation and control, self-confidence, desire for achievement, influence, promotion of student development, organisation and coordination, 12 characteristics of professional knowledge skills, analytical thinking and reflective ability, (2) these 12 characteristics can be summarised into 4 dimensions: help and service, personal effectiveness, management skills and cognitive dimensions and (3) 12 characteristics of the model. The top 5 in the ranking are interpersonal understanding and communication, self-regulation and control, respect for students, student service orientation and promotion of student development.