Abstract In order to explore the pathogenesis of autism spectrum disorder (ASD) from a new perspective, it is found through literature review that vitamin D(Vit D) may play a significant role in the onset and development of ASD by inhibiting early brain overgrowth, regulating metabolism of central nervous system, modulating immune responses, reducing inflammation and influencing genome stability. Furthermore, Vit D supplementation in individuals with ASD has shown to alleviate symptoms. However, the mechanisms by which Vit D affects ASD remains unclear, and the effectiveness of Vit D treatment in improving ASD symptoms remains controversial due to variations in sample sizes, detection methods, dosage and confounding factors. Future research needs to focus on multi center, large scale randomized controlled trials and ASD animal models with Vit D deficiency to further explore the specific role of Vit D in the pathogenesis and treatment of ASD, which could provide reliable evidence for the early detection, intervention and treatment of ASD.