From the perspective of positive psychology, this paper attempts to explore the effect of happiness class group intervention counseling on the happiness intervention of first-year college students through the form of group counseling and the design of appropriate group activity programs using the training methods advocated by positive psychology. Taking first-year college students as the research object, designing group activities with happiness as the theme, carrying out group psychological counseling, and utilizing a combination of qualitative and quantitative methods to explore the differences in changes in the dimensions of happiness of first-year college students before and after the happiness class group intervention. The differences between the two happiness scores in demographic variables were compared, and a t-value test was conducted for the two happiness scores. Combined with members’ evaluation of the happiness class group intervention, the effect of the happiness class group intervention on the happiness of first-year college students was verified. The results show that there is no significant difference between the experimental group and the control group in the dimension of family satisfaction, p>0.05. There are substantial differences between the experimental group and the control group in the dimensions of school satisfaction, academic satisfaction, friendship satisfaction, freedom satisfaction, and environment satisfaction, p<0.05.