With the continuous enhancement of road traffic network, large-angle oblique box culvert structure is widely used in highway, railway and other three-dimensional intersection engineering, but because of its complicated technology, difficulty coefficient and high quality requirements, it brings some difficulties to construction safety management and quality control. In order to clarify the construction quality and risk control points of large-angle inclined box culverts, this study analyzed the preparation work before jacking and the main factors affecting the jacking process, established the risk assessment index system of box culverts construction, and proposed a risk analysis method of box culverts construction. Firstly, the analytic Hierarchy Process (AHP) is used to study the importance degree of each influencing factor. Secondly, the fuzzy comprehensive evaluation model is constructed based on hierarchy theory and system theory. Finally, the method is applied to the risk assessment of box culvert construction in a project to verify its scientific rationality. The results show that the method is practical and effective, can systematically reflect the construction characteristics and connotation of box culvert, and has certain guiding significance for the quality management and risk prevention and control of box culvert jacking construction.