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This paper analyzes the risks related to amphibious vehicle navigation, evaluates the safety risks, and puts forward a feasible solution to the possible risks. Based on Bayesian point estimation and Bayesian learning estimation of traffic accidents related to amphibious vehicle navigation on the sea, an analysis model of amphibious vehicle navigation on the sea (QRA) is established. The QRA of relative risk is obtained by Bayesian network. The results show that this method is used to describe the risk distribution of amphibious vehicle navigation on the sea, and the results related to various characteristics are displayed on QRA. The relative risk of amphibious vehicle navigation is analyzed comprehensively. The scale of high-risk areas is arranged in descending order as follows: 1) waterway pilotage domestic waterway navigation; 2) coastal area non-pilotage national waterway navigation. The evaluation model has good application value and can provide reference for amphibious vehicles to navigate safely at sea.