The purpose of this study is to find out the effect of group art therapy using color on the self-efficacy of novice art therapists. The subjects of the study were novice art therapists in P city, consisting of 8 people each in an experimental group and a control group, and conducted a total of 12 sessions of 90 minutes per session. As a research tool, the self-efficacy scale and the change by session were examined through the Suenaga Tamio Heart & Color Chart. For data analysis, a t-test was conducted to verify the homogeneity of the experimental group-control group, and repeated measurement variable analysis was conducted to see the effect of the test timing and group. The results of this study are as follows. First, as a result of examining the amount of repeated measurement changes in confidence, self-regulation efficacy, and task difficulty, which are sub-areas of self-efficacy in group art therapy using color, there was a statistically significant difference in test timing. Second, it can be seen that there has been a positive change in self-efficacy as a novice art therapist by expressing works through the experience of color in the group art therapy program using color. Therefore, this study is meaningful in that it improved the self-efficacy of novice art therapists through group art therapy using color and suggested the applicability of a program in which art therapists grow as experts.