<p>Adolescents with higher levels of emotion dysregulation are more likely to use maladaptive emotion regulation strategies and then suffer higher risks of mental health problems. Furthermore, intergenerational influences (e.g., maternal adverse childhood experiences (ACEs) and maternal maladaptive emotion regulation strategies) may contribute to adolescents’ development of maladaptive regulation strategies. Previous studies found that maternal ACEs could be related to their emotion regulation capacity, as well as between maternal and offspring emotion regulation. However, whether specific maternal maladaptive emotion regulation strategies can play a mediating role linking maternal ACEs to adolescents’ maladaptive regulation strategies, it should be further analyzed. The present cross-sectional study recruited 638 mothers (aged 41–50 years) and their adolescent children (aged 12–13 years) from China. Mothers completed the Adverse Childhood Experiences Questionnaire and Cognitive Emotion Regulation Questionnaire, and their children completed the Cognitive Emotion Regulation Questionnaire. The results of the Structural Equation Model (SEM) using R Studio indicated that maternal maladaptive emotion regulation strategies mediated the relationship between maternal ACEs and adolescents’ maladaptive strategies. The study also revealed that maternal ACEs were linked to three distinct maternal maladaptive strategies: others-blame, rumination, and catastrophizing, which in turn are related to adolescents’ catastrophizing, rumination, and others-blame strategies. Mothers with childhood adversities reported higher levels of emotion dysregulation. Higher maternal dysregulation was, in turn, associated with greater dysregulation in their adolescents. This study provides a rationale for exploring how parental adverse experiences during childhood affect adolescents’ emotion regulation and supports intervention programs for family and clinical counselling treatment.</p>