The purpose of this study is to investigate the moderating effects of the supervisory relationship between the evaluative concerns perfectionism and psychological burnout among play therapists. For this, 173 play therapists who have worked in the area of play therapy in Metropolitan area and Daejeon with supervision experience. The summary of the research results is as follows. First, the correlation analysis result of between evaluative concerns perfectionism, supervisory relationship and psychological burnout of play therapists, psychological burnout and evaluative concerns perfectionism showed a static correlation. On the other hand, supervisory relationship totals and sub-factors and psychological burnout showed inappropriate correlation. Second, a hierarchical multiple regression analysis was performed to verify the moderating effect of the supervisory relationship between the evaluative concerns perfectionism and psychological burnout. The study found that positive supervisory relationships are a protective factor for psychological burnout, especially high levels of safety bases and structures have the ability to mitigate burnout of play therapists. As a result of the supervisory relationship serving as a protection factor in the professional growth of play therapists and the reduction of psychological burnout, importance of forming a positive supervisory relationship is emphasized.