The main goal of the present study is to determine the effectiveness of transcranial direct electrical stimulation (tDCS) on executive functions, emotion regulation, feelings of shame, guilt, and disgust sensitivity in adolescents with obsessive-compulsive disorder in Tabriz city. The research design is of experimental type with continuous single case method with different subjects and is practical in terms of purpose. The statistical population of the present study included all teenagers suffering from obsessive-compulsive disorder who were referred to Yas treatment center in Tabriz in 2021 and between May and September. The sample of the present study included four people who were selected by purposive sampling and underwent ten sessions of transcranial direct electrical stimulation (tDCS). Treatment results of the subjects with disgust sensitivity scale (Haidt, McCauley, & Rozin, 1994), guilt questionnaire (Kugler, & Jones, 1992) and Shame Questionnaire (Cohen, Wolf, Panter, & Insko, 2011) and Child and Adolescent Emotion Regulation Questionnaire (Gross, & John, 2003) and computer software of visual working memory scale N-Beck, Stroop test, go/go test, the Wisconsin Card Sorting Test were evaluated. The obtained data were analyzed by visual display, reliable Change Index, improvement percentage, and percentage of non-overlapping data. The results showed that transcranial direct electrical stimulation (tDCS) treatment has a significant effect on the variables of shame and guilt, disgust sensitivity, emotion regulation, and executive functions (except for preservation error Wisconsin) in the intervention and follow-up stages. According to the results, it can be said that to improve the treatment of adolescents suffering from obsessive-compulsive disorder, transcranial direct electrical stimulation (tDCS) is recommended in reducing feelings of shame, guilt, disgust sensitivity, and emotion regulation and improving the executive functions of adolescents suffering fro