Social interaction which is a relationship between one and the other is important to be applied by students in fostering moral actions and actions, with the existence of good and harmonious social interactions between fellow students will lead to a habit to make a good relationship based on moral actions. This research was conducted at SMK Negeri 3 Gunungsitoli in the 2018/2019 Academic Year and the total population of class X students was 30 students. The research instrument used in this study was a questionnaire Variable (x) about social interaction and Variable (y) about morality. This study uses a descriptive approach with quantitative methods oriented to problem solving based on data in the field. The results of this study indicate that there is a significant relationship between social interaction with student morality in class X SMK Negeri 3 Gunungsitoli in the 2018/2019 Academic Year. This is based on testing the hypothesis by using a one-party t test at a significant level of 0.05 where t = 25.92> t table = 1.701.