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Restricted repetitive behaviors (RRBs), as one of the three core features of autism spectrum disorder (ASD), significantly impact autistic children’s knowledge acquisition, skill development, and quality of life. In recent years, physical activity interventions—characterized primarily by exercise-based approaches—have garnered widespread attention for their effects on RRBs in children with ASD, with accumulating evidence supporting their efficacy. Following the PRISMA guidelines, this study conducted a systematic review based on predefined inclusion and exclusion criteria, analyzing relevant literature on physical activity interventions targeting RRBs in autistic children retrieved from the Web of Science, EBSCO, PubMed, ProQuest, and China National Knowledge Infrastructure (CNKI) databases. The search period spanned from January 2005 to July 2025. The Mixed Methods Appraisal Tool (MMAT) was employed to assess the quality of included studies. The analysis focused on seven dimensions: study population, research design, intervention setting, duration, intensity, methods, and outcomes. This comprehensive overview aims to elucidate the current research status and characteristics, thereby providing insights and guidance for future practice and investigation in this field.