The purpose of this study is to examine the effects of group art therapy on the happiness of children. The subject of this study was 16 children who were agreed to the program test from their parents among 4th to 6th grade of elementary school children recommended to enhance the happiness from the manager of B community child center in A city. Among them, the experimental group consisted of 8 children who submitted a consent form in the program and the rest of them was control group. The program was organized a total of twelve sessions, for 90 minutes per each session, twice a week from February 6 to March 16, 2017. Research tool used Happiness Test developed by Kang(2008). The program consisted of the intimate formation and relationship formation in the early stage, then self-respect, optimism, and relationship with friends in the middle stage, and then strengthening happiness in the later parts. For processing the data, first, the homogeneity between the two group confirmed that an independent t-test was conducted using the scores of the test for happiness of the experimental group and control one. Second, in order to verify the effectiveness of the program, the repeated measure ANOVA was carried out using the pre-and post-test scores of the experimental group and control one. As a result, group art therapy was effective for increasing the overall happiness of children. It was effective for increasing the happiness of children in low-rank scope.