This study explores the impact of 16 weeks of football training on the Big Five personality traits of primary school students, aiming to promote the development of a well-rounded personality and good qualities in students. The study uses an experimental method, employing the Big Five Personality Inventory developed by American psychologists Costa and McCrae as the measurement tool. The experimental group of students underwent 16 weeks of football training intervention. Longitudinal comparisons revealed that students in the control group showed improvements in neuroticism and agreeableness but had no significant changes in conscientiousness, openness, or extraversion. In contrast, students in the experimental group showed significant improvements in all personality dimensions except conscientiousness after the intervention. Cross-sectional comparisons indicated no significant differences in psychological dimensions between the experimental and control groups before the experiment. However, after the experiment, the experimental group scored higher in all personality dimensions than the control group. Comprehensive analysis results indicate that school football training significantly promotes the development of the Big Five personality traits in primary school students. Nevertheless, there remains room for improvement in conscientiousness, specifically in self-control. This research provides scientific theoretical support for future physical education and sports training, and it is of great significance for formulating forward-looking school football development strategies.