This study was to verify the effect of the REBT-based group art therapy program on the expression of anger and the satisfaction in the parental role of mothers with young children. For the study, 24 mothers with young children residing in D city were selected, and 12 were assigned in the experimental group and 12 to the control group. Group art therapy was conducted once a week for a total of 10 sessions for 90 minutes each session from June 5 to August 7, 2018. The assessment tools used were the anger expression scale for adults and the parenting satisfaction scale. To analyze the data, both quantitative and qualitative analyses were carried out. For quantitative analysis, a repeated measures ANOVA was conducted. The results of this study were as follows: First, REBT-based group art therapy had a significant effect on anger release, anger suppression, and anger management. Second, REBT-based group art therapy had a significant effect on the parent-child relationship and parental role conflict among sub-factors of parenting satisfaction, but the effect did not persist. Third, the results of the qualitative analysis also indicated that participants came to control their anger in a desirable way and change their parenting style of participants and the parent-child relationship as art therapy progressed. Therefore, the study has presented that an REBT-based group art therapy program can be used as an early intervention program to prevent anger problems related to child rearing.