Abstract: Autism spectrum disorder (ASD), a neurodevelopmental disorder during early childhood, currently has no effective treatment. The prevalence of ASD has been increasing, which brings a heavy burden to the family of the patients and the society. Children with ASD are accompanied by gastrointestinal symptoms and have an imbalance of intestinal microbiota. Fecal microbiota transplantation (FMT) can improve autism-related symptoms in children with ASD. This review aims to summarize the research progress of FMT for treating ASD to provide a novel strategy for this untreatable disease.