To understand the addictive characteristics of non-suicidal self-injury (NSSI) behavior and its related influencing factors in adolescent patients with depressive disorders. Methods: A total of 152 adolescent patients diagnosed with depressive disorders at our hospital’s psychiatric outpatient clinic were included, divided into an NSSI group (85 cases) and a non-NSSI group (67 cases) based on the presence or absence of NSSI behavior. The Hamilton Depression Rating Scale (HAMD), Adolescent Self-Harm Inventory (ASH), Ottawa Self-Injury Inventory (OSI), Adolescent Life Events Scale (ASLEC), Toronto Alexithymia Scale (TAS), Childhood Borderline Personality Features Scale (BPFS-C), and Family APGAR were administered to assess and analyze the patients. Results: The NSSI group scored higher on HAMD, ASLEC, TAS, and BPFS-C, while scoring lower on the Family APGAR compared to the non-NSSI group (P<0.05). In the NSSI group, 55.29% of patients exhibited addictive NSSI behavior, and the OSI addiction score was correlated with HAMD, severity of NSSI, ASLEC, BPFS-C, and Family APGAR scores (P<0.01); depression severity, NSSI severity, adverse life events, borderline personality traits, and family dysfunction were found to be influencing factors for NSSI behavior addiction (P<0.05). Conclusion: Adolescent patients with depressive disorders exhibit certain addictive tendencies in their NSSI behavior. Severe depression, severe NSSI, borderline personality traits, family dysfunction, and adverse life events may be risk factors leading to NSSI behavior addiction. Adolescent patients with depressive disorders accompanied by NSSI behavior are more likely to have borderline personality traits, experience adverse life events, family dysfunction, and alexithymia.