Quantitative evidence suggests that ethnic disparities in maternal healthcare use are substantial in Western China, but the reasons for these remain under-researched. We undertook a systematic review of English and Chinese databases between January 1, 1990 and February 23, 2018 to synthesize qualitative evidence on barriers faced by ethnic minority women in accessing maternal healthcare in Western China. Four English and 6 Chinese language studies across 8 provinces of Western China and 13 ethnic minority groups were included. We adapted the 'Three Delays' framework and used thematic synthesis to categorize findings into six themes. Studies reported that ethnic minority women commonly held traditional beliefs and had lower levels of education, which limited their willingness to use maternal health services. Despite the existence of different financial protection schemes for services related to delivery care, hospital birth was still too costly for some rural households, and some women faced difficulties navigating reimbursement procedures. Women who lived remotely were less likely to go to hospital in advance of labour because of difficulties in arranging accommodation; they often only sought care if pregnancies were complicated. Poor quality of care in health facilities, particularly misunderstandings between doctors and patients due to language barriers or differences in socio-economic status, and clinical practices that conflicted with local fears and traditional customs, were reported. The overall evidence is weak however: authors treated different ethnicities as if they belonged to one homogeneous group and half of the studies failed in methodological rigour. The current evidence base is very limited and poor in quality, so much more research elucidating the nature of 'ethnicity' as a set of barriers to maternal healthcare access is needed. Addressing the multiple barriers associated with ethnicity will require multi-faceted solutions that adequately reflect the specific local context.