Based on the visibility observation data from meteorological stations in China during 1980-2014 and the community economy and traffic disaster data of China, the index system and corresponding weight of low visibility disasters risk assessment on highway in China are established by using the methods of analytic hierarchy process (AHP), expert scoring and entropy weight. And the region division of low visibility risk is also carried out. The results indicate that the highways in eastern China, northern Xinjiang and south of the Xinjiang Basin are in high risk of low visibility disaster, while those in midwest of China are in low risk. Using the method of AHP to do the risk assessment of low visibility on highway could reduce the influence of subjective factors effectively and make the assessment result more scientific and reasonable.