Affected by the COVID-19 epidemic and the “double reduction policy” in China, educational pressure of parents on children is increasing, while children’s psychological problems are becoming more and more obvious. In order to cope with current situation, 60 children with psychological problems were collected, of which 30 cases were sand play therapy and the other 30 cases were routine psychotherapy. The improvement of symptoms after 3 months was observed and compared with the scores of Conners parental questionnaire. The effective rate of the treatment group was 86%, which was significantly higher than that of the routine guidance group by 45%. The scores of learning problems, physical and mental disorders, ADHD and anxiety of children in the treatment group were lower than those before treatment. Results shows that sand table play therapy in children’s mental health education is worth popularizing.