[Background] Bidens alba (L.) DC, a worst weed native to America, is widely distributed in tropical and subtropical regions of the world, but its potential distribution area in the world and China is still unclear.[Method] In this study, the MaxEnt niche model was used to predict the potential distribution of B. alba in China and the world.[Result] B. alba was mainly distributed in the tropical and subtropical regions, between 15° and 30° in both the Northern and Southern Hemispheres. Its medium and highly suitable areas are mainly concentrated in southern North America, south-central South America, southern Africa, northern Southeast Asia, and southeastern Australia. The main suitable area of B. alba in China was mainly in Guangdong, Guangxi, Hainan, Yunnan, Fujian and Taiwan. It is predicted that the suitable area of B. alba would not change significantly in the world, but could increase in China by 2070.[Conclusion] B. alba has the risk of further expansion in China.