Domestic and foreign scholars have conducted increasingly extensive research on tree drawing projection, including applied studies on local information such as tree roots, trunks, and canopies. However, there are relatively few explorations on the differences in the canopy height of tree drawings by subjects with different confidence levels and the relationship between canopy height and confidence. In this study, young students aged 18~28 were selected as subjects. The height of the tree canopy was measured using a ruler to obtain relevant data. Their confidence data was tested through the Youth Student Confidence Questionnaire. The relevant data were analyzed using SPSS 26.0 to explore the correlation between the confidence level of young students and the height of the canopy in their tree drawings. The results revealed a significant correlation between the height of the canopy and the confidence level and its various dimensions. There were significant differences among young students of different groups in achievement confidence, coping confidence, quality confidence, and the total score of confidence.