In order to effectively evaluate the maritime emergency rescue capability of helicopters and improve their emergency rescue efficiency, it is proposed that the safety issues in the three stages of "pre-prevention--in-event response--post-event recovery" in the rescue process be taken into account in the helicopter maritime emergency rescue system.Based on the "5W1H" analysis method, the research framework was designed, and the evaluation indicators of helicopter maritime emergency rescue capability were screened through literature analysis, questionnaire survey, expert consultation and other methods, and 21 evaluation indicators were determined to build the evaluation index system of helicopter maritime emergency rescue capability. The analytic hierarchy method based on D-S evidence theory was used to determine the index weight, and the fuzzy comprehensive evaluation method was used to construct a comprehensive evaluation model of helicopter maritime emergency rescue capability. The evaluation model was applied to the rescue exercise taking the injury of offshore wind turbine maintenance personnel as an example, and the score was 86.89, and the rescue ability was judged to be "strong".The results show that the evaluation index system and evaluation model have certain practicality, and can effectively evaluate the ability of helicopter emergency rescue at sea.