The study was aimed at verifying the effect of school-based SEL positive intervention on SEL and SWB in male middle school students. The results are as follows. First, the program in this study was found to partially improve the SEL of male middle school students. It was effective in improving SEL basic knowledge and functions, and this effect lasted until eight weeks after the end. However, the program was ineffective in reducing the external�ization problem and was effective in reducing the internalization problem, but this effect was eliminated after 8 weeks. Second, the program was found to improve SWB of male middle school students. Specifically, it was ineffective in increasing positive to affect and was effective in decreasing negative affect, but this effect was eliminated after eight weeks. It was also effective in improving life satisfaction, which lasted eight weeks after the end. These results show that school-based SEL positive intervention programs can be effective in preventing and treating social and emotional problems in male middle school students as well as promoting SWB.