The purpose of this study was to investigate how group art therapy using the autobiography affects happiness and quality of life for the elderly in long-term care hospitals. The study was conducted on 12 participants living in long-term care hospitals in N district of S City. The selected participants were over 65 years old, and could communicate and participate in program activities. Six of the 12 participants who received below-average scores in the pre-test were placed in the experimental group, and the other six were placed in the control group. From September 2019 to November 2019, the company conducted experimental sessions once a week for 60 minutes, a total of 12 times, while the control group did not receive any treatment. The Happiness Test, and Quality of Life Test were used as research tools, and the Wilcoxon signed rank test in the SPSS 24.0 program was used to analyze quantitative changes. The results of this study were as follows. First, the group art therapy using autobiography was found to be effective in improving the happiness of elderly in long-term care hospitals. Second, the group art therapy using autobiography was found to be effective in improving the happiness of elderly in long-term care hospitals. Overall, the study showed that the group art therapy using autobiography positively affects the improvement of happiness and quality for life of elderly in long-term care hospitals. Based on these results, the implications and limitations of this study were discussed.