Hainan’s marine intangible cultural heritage, with its unique value, occupies an important position in global cultural diversity, but it is currently facing an endangered situation. This paper utilizes the Delphi method to select the initial indicators for the evaluation of the endangerment of Hainan’s marine intangible cultural heritage, then applies the hierarchical analysis method to determine the weights of the indicators at each level and evaluates the endangerment of Hainan’s marine intangible cultural heritage based on the fuzzy comprehensive evaluation method. Then, according to the current situation and evaluation results of Hainan marine intangible cultural heritage, the digital inheritance and protection path of Hainan marine intangible cultural heritage is designed by using modern technology as a means. Among the specific indicators of the endangerment evaluation index system of Hainan marine intangible cultural heritage, the economic benefit has the largest weight, which is as high as 0.104. It shows that the economic benefit of preserving and preserving Hainan marine intangible cultural heritage needs to be improved. In the endangerment evaluation of Hainan’s marine intangible cultural heritage, for example, the overall evaluation value is 3.525, and its endangerment status is between generally endangered and relatively endangered. Among them, the evaluation values of social and cultural factors are higher, favoring comparatively endangered, indicating that more consideration should be given to the inheritance and protection of A Hainan marine intangible cultural heritage from both social and cultural aspects.