The study was conducted to investigate the effect of parent-child communication training on peer relationship skills and school adaptation of middle school students. The research questions were set as follows. First, what effect did parent-child communication training have on the peer relationship skills of middle school students, and second, what effect did parent-child communication training have on middle school students school adaptation. The subjects of this study were 22 parents of middle school students in G city and 22 middle school students. The peer relationship skill scale and school adaptation scale were used as research tools, and frequency, t-test, and covariate analysis (ANCOVA) were performed as analysis methods. Looking at the results of this study, it was found that parent-child communication training improves the peer relationship skills of middle school students. Second, parent-child communication training was found to enhance middle school students ability to adapt to school. It can be seen that the results of this study provide implications in the educational field regarding communication training between parents and children, peer relationship skills of middle school students, and school adaptation.