Mental health education plays an increasingly important role in the field of higher education teaching. Carrying out the mental health education of college students is the requirement for colleges and universities to strengthen humanistic care and implement the fundamental task of morality and cultivating people. It helps college students to enhance their self-awareness, achieve self-regulation and self-healing, so as to grow up healthily. "Internet +" is conducive to promoting the online courses and popularization of mental health education, but there are also problems such as insufficient attention of students, lack of effective interaction between teachers and students, and weak professional ability of teachers. Under the background of "Internet +", colleges and universities should build a three-dimensional mental health curriculum system in the form of online courses, use the anonymity and openness of the Internet to enhance teaching interaction and experience, and promote the integration of teachers' ideological education and mental health education capabilities.