ObjectiveTo systematically review the influencing factors of patients’ adoption intention toward online medical services. MethodsCNKI, VIP, WanFang Data, Web of Science, PubMed and EMbase databases were electronically searched to collect cross-sectional studies on the influencing factors of patients’ adoption intention toward online medical services from inception to August 2021. Two reviewers independently screened literature, extracted data and assessed the risk of bias of the included studies; then, meta-analysis was performed by using Stata 16.0 software. ResultsA total of 28 cross-sectional studies involving 10 200 patients were included. The results of meta-analysis showed that perceived usefulness, perceived ease of use, and performance expectations were highly positively correlated with adoption intention. Effort expectation, social influence, convenience, self-efficacy, perceived value, individual innovation and perceived behavior control were moderately positively correlated factors. Perceived health threat was a low positive correlation factor of adoption intention. Resistance to change and perception of risk were moderately negatively correlated. Technology anxiety was a low negative correlation factor of adoption intention. There was a highly positive correlation between adoption intention and use behavior. ConclusionCurrent evidence shows that there is a highly positive correlation between adoption intention and use behavior, influencing factors of patients’ adoption intention include perceived usefulness, perceived ease of use, perceived value, etc.