Objective: To explore the effects of positive parenting on mental health symptoms in children with ADHD and the mediating effect of family closeness between the two. Methods: Questionnaires were administered to 70 children with ADHD and their parents using the Positive Parenting Inventory, the Family Environment Inventory, and the 90- item Symptom Inventory. Results: (1) Correlation analysis showed that the level of positive parenting of children with ADHD was significantly and negatively associated with mental health symptoms of children with ADHD. Both parental positive parenting level and family closeness were significantly positively correlated. Family closeness was significantly and negatively associated with mental health symptoms in children with ADHD. (2) Mediation analysis showed that family closeness mediated the relationship between parenting level and mental health level of children with ADHD. Conclusion: Parenting promotes family intimacy and physical and mental health in children with ADHD, and can be beneficial in improving ADHD children’s hyperactivity symptoms and emotional problems.