Abstract: Digital technology plays a crucial role in promoting the green development of tourism. This study measures the tourism green total factor productivity of provinces along the Belt and Road in China from 2013 to 2020 using the DEA model. It then employs the GMM and PVAR models to explore the short-term nonlinear and long-term dynamic impact of digital technology on tourism green total factor productivity. Additionally, the study employs the SDM to examine its spatial spillover effect. The results reveal U-shaped relationships between digital technology and tourism green total factor productivity, mainly concentrated in the core area of the Silk Road Economic Belt. In the long run, digital technology has a positive and continuous dynamic impact on tourism green total factor productivity. Furthermore, the study identifies a significant nonlinear spatial spillover effect of digital technology on tourism green total factor productivity, mainly due to spatial spillover between regions. Finally, the study provides recommendations for promoting the green transformation of tourism, vigorously developing the digital economy and actively promoting the application of digital technology in tourism.