According to the requirement for largescale competitions with high crowd density and high personal mobility, the risk factors of mobile communication network are analyzed and studied from the perspective of network risk, business risk, supporting risk, safety risk, quality risk and so on, comprehensive evaluation index system for communication network risk is constructed, and the risk assessment model based on analytic hierarchy process (AHP), entropy weight method and fuzzy mathematical algorithm is proposed. Both subjective weight and objective weight are added into the model, and a new combination method is adopted, including the calculation of the comprehensive weight by considering the proportion relation of the index in the middle layer so as to reduce the error caused by the uneven weight distribution. Finally, an example is given to verify that the output of the model is close to the actual situation, indicating that the model can better predict and evaluate the risk status of the mobile communication network.