“The Belt and Road”( B&R) initiative may have a profound effect on all aspects of socio-economic development across the relevant countries within the region，among which employee mobility is a basic but critical issue. By applying big data technics and text analysis to massive resume data，this paper collects millions of authentic resumes that are publicly available online from the B&R countries in Southeast Asia and South Asia and reconstructs a panel data set to capture the history of employee mobility in recent years. On this basis， this paper empirically investigates the influence of the B&R on employee mobility in the relevant countries. Our results demonstrate that the B&R，as a result of the implementation of related investment projects，has significantly improved the level of employee mobility in relevant countries. Meanwhile，this paper also conducts a quasi-natural experiment to further verify the main findings by using PSM-DID method. The findings of this paper may help to enhance our understandings of the significance of the B&R as well as its global impact. Moreover，the innovative way of utilizing the big data of online resumes in this paper may provide important implications for future studies in related fields.