The study was conducted to develop and validate a delinquency prevention education for early-youths. The delinquency prevention education was developed based on a preliminary analysis of prior research and an assessment of educational needs. The program underwent content validity verification and pilot testing, resulting in the final delinquency prevention education curriculum. The effectiveness of the program was validated using data collected from an experimental group of 20 participants and a control group of 20 participants, excluding cases of mid-term withdrawal or those with more than 50% absenteeism among the 12-13-year-old early youths who received the attendance order. The research findings are as follows. Firstly, the early youths who participated in the delinquency prevention education showed an increase in positive emotions and a decrease in negative emotions. Additionally, their interpersonal relationship competence, career maturity, and legal consciousness all exhibited statistically significant changes. In contrast, the control group only exhibited a significant change in positive emotions. Secondly, the results of Cohen’s effect size analysis revealed significant effects across the board for the emotional state, nterpersonal relationship competence, career maturity, and legal consciousness of the early youths who participated in the delinquency prevention education. Based on these findings, practical recommendations were made for the implementation of a more substantive delinquency prevention education program targeted at early youths.