The main help of unity and cooperation to college students' mental health lies in unity and cooperation, which can make college students feel a sense of accomplishment and personal satisfaction. In the process of unity and cooperation, college students can realize a certain degree of self-worth and gain a kind of self-confidence. In the process of unity and cooperation, college students can communicate with their peers and find an emotional identity and resonance. At the same time, in this process, they got rid of loneliness. When they encounter difficulties, they can help each other and face and overcome them together. In this process, college students' psychological endurance becomes stronger and stronger, and they can get mutual recognition, which will be of great help to college students' future study. At the same time, it has accumulated some experience for college students to enter the workplace in the future. This kind of experience lies in how to get along better with your colleagues in the future workplace, realize mutual cooperation and better expand your social circle for yourself. On the psychological level, unity and cooperation can make college students more optimistic. At the same time, for college students, unity and cooperation itself is also a mutual benefit and win-win situation. With the mutual solidarity and cooperation between classmates, everyone will feel happy and happy. This joy of overcoming difficulties gives them a good inspiration in life, so that they dare to face any difficulties and adversity in their later lives and have a really strong heart.