Objective To critically appraise and synthesize qualitative evidence of non-suicidal self-injury （NSSI） experiences of adolescents, and to provide a reference for the development of personalized intervention program to help them return to family and society.Methods The literature search was conducted on domestic and international databases from inception up until 1 June 2023.Qualitative studies were considered for inclusion if they reported adolescent NSSI experiences and feelings, published in English or Chinese language, and met quality criteria following the Joanna Briggs Institute guidelines.A meta-aggregative approach was used to produce a comprehensive set of synthesized findings.Results A total of 13 studies involving 226 adolescents met the inclusion criteria.Forty-two research findings were extracted and integrated into 11 new categories, then 3 synthesized findings were generated:the triggers of NSSI; multi-dimensional experiences of NSSI; and views on treatment and help.Conclusion The early experiences of adolescents engaging in NSSI are varied and complex. More attention should be paid to adolescent NSSI, and cooperation among family, school and medical institution should be promoted, to achieve information sharing, early prevention, and cooperative response, thus to promote adolescents′ mental health.