The purpose of this study was to determine how group art therapy affects the level of Internet addiction, psychological changes, and problem-solving ability of middle school students who rely on the internet. The subjects were 50 first- and second- graders from middle schools A and B in Gyeonggi, and the researcher visited these schools once or twice a week and conducted a total of 11 group art therapy sessions. The researcher conducted a Korean internet addiction test (K-scale), a psychological change diagnosis test, and a Person Picking an Apple from a Tree(PPAT) drawing test as pre- and post-test. Data were analyzed it using the SPSS 19.0 program. As a result of the study, the internet addiction score decreased in the experimental group, and the score improved in the control group, which was statistically significant. Second, the psychological change diagnostic test score was improved in the experimental group, and the score decreased in the control group, which was statistically significant. Third, in the experimental group, the problem-solving ability score of the PPAT drawing test format scale was improved, and in the control group, the problem-solving ability and developmental stage score decreased, which was statistically significant. Based on these results, the implications and limitations of this study are discussed.