A survey of 481 children aged 9 to 15 in five public schools in Jiangsu was conducted to explore the relationship between physical activity levels, emotional intelligence and school bullying. Participants completed the “youth physical activity” questionnaire to measure the level of physical activity of children, bullying, general aggression, bullying risk, positive and negative behavior. We use “trait meta-affective scale” to assess attention, discrimination and emotional resilience. Binary logistic regression analysis was used to determine the relationship between physical activity, bullying and emotional intelligence. We get the results that a total of 68.6% of participants have low levels of physical activity. The bullying index is 54.3%. Students who do not participate in sports regularly are more likely to be either victims of school bullying or perpetrators of general aggression. In addition, girls who were less in physically active had less control over their emotions. The results suggest that schools should encourage physical activity and raise the physical activity levels of school-age children, which can help reduce bullying and violence in schools by resolving bad emotions and improving mental health.