In this study, we aimed to examine whether attachment-anxiety and attachment-avoidance affect emotional expression ambivalence in maladaptive multicultural youth, and to confirm the mediating effect of interpersonal problems in the relationship between maladaptive multicultural youth attachment style and emotional expression ambivalence. In the study, based on previous research suggesting that understanding the level of attachment of close others is more important than understanding the attachment pattern with parents, the subjects of the study were multicultural adolescents attending 10 high schools located in Gyeonggi-do. A survey was conducted on a total of 176 participants, analyzing 78 male and 98 female adolescents. The self-report questionnaires ECR-R, AEQ-K, and IIP were used for measurement. For the analysis, descriptive statistics and correlation analysis were conducted using the SPSS/WIN 24.0 program, followed by regression analysis and Sobel tests to verify the mediation effect. The results of the study showed firstly significant differences in the correlation between interpersonal relationship problems and emotional expression ambivalence according to the attachment type of maladaptive multicultural youth. Secondly, it was found that interpersonal problems had a mediating effect in the relationship between emotional expression ambivalence, according to the attachment type of maladaptive multicultural youth.