With the continuous expansion of infrastructure construction in high-altitude and high-altitude areas of China, cracking of tunnel lining structures has become increasingly frequent. Due to the numerous factors affecting lining cracking and the unclear sensitivity of various indicators, there is uncertainty in conventional risk prediction methods. In order to accurately evaluate the safety of concrete lining structures during tunnel construction, this article comprehensively considers five influencing factors, including tunnel surrounding rock characteristics, environmental factors, secondary lining concrete characteristics, load effects, and human factors, and constructs a risk assessment index system for tunnel lining cracking. Collecting typical working condition data at home and abroad, based on the Delphi entropy weighting method combined with subjective and objective weighting index layers, and combining cloud model related theories to construct a combined weighting normal cloud model, a risk assessment of a concrete lining structure in a tunnel was conducted using this model. The results showed that the risk of cracking was level IV, and the bearing capacity of the lining structure needs to be strengthened during the construction process.