In order to master the state of offshore wind turbine foundation in service and evaluate the state of offshore wind turbine foundation, a state evaluation model of offshore wind turbine foundation combining Fault Tree Analysis (FTA), Analytic Hierarchy Process (AHP) and fuzzy comprehensive evaluation methods is proposed. For jacket offshore wind turbine foundation, considering marine corrosion and seabed scouring, the pile soil interaction is simulated by p-y curve method, and the dynamic response analysis is conducted under the action of wind, wave and current loads. The fault tree is used to analyze the failure mode and determine the evaluation indexes, a judgment matrix is constructed to calculate the index weight, and the fuzzy comprehensive evaluation method is used to evaluate each index and the whole. This model combines the advantages of each evaluation method, makes the evaluation results more convincing, and can provide technical reference for the operation and maintenance management of offshore wind farms.