Atherosclerosis (AS) is the pathological basis of cardiovascular diseases. The oral cavity and the gut together constitute the oral-gut microbial axis through microbial translocation, metabolic interactions, and immune crosstalk. Dysbiosis of this axis promotes the occurrence and development of AS via bacterial translocation, metabolic disorders, and barrier damage. Guided by the holistic concept and syndrome differentiation-based treatment, traditional Chinese medicine (TCM) exerts anti-AS effects by multi-target regulation of the oral-gut microbial balance, inhibiting vascular inflammation and lipid deposition. This article systematically elaborates the association between the oral-gut microbiota and AS, explores the research progress of TCM in modulating microecology for the prevention and treatment of AS, analyzes the limitations of current studies, and prospects future directions, so as to provide new insights and theoretical basis for TCM in preventing and treating AS.