Abstract: In view of the failure mechanism and weakness of the existing protective measures for offshore wind power foundations, the standing vortex principle of the disturbance flow ring is used to reduce the subsidence failure of the riprap layer by water flow, the riprap layer is fixed with a sleeve to weaken its edge failure, and the shear failure of the riprap layer is effectively weakened by closely fitting the biomimetic water grass to the riprap layer. Three new composite protection methods of riprap + disturbance flow ring, riprap + sleeve, riprap + biomimetic water grass are proposed respectively, and ten specific composite protection designs are proposed according to the arrangement of three types of composite protection measures. Further physical model tests were carried out to evaluate the protective effects of different composite protection methods. The test results show that the protection effect of the three types of composite protection under the action of ocean current is better than that of riprap alone protection, and the protection efficiency is above 66%. When the riprap laying range is 3 times the diameter of single pile and the thickness is 2 times the median diameter of riprap; When the inner diameter of the disturbance flow ring is 2 times the pile diameter and the distance from the riprap layer is 0.5 times the pile diameter, the disturbance flow ring can play a better role, so that the water flow reaching the riprap layer and the surrounding sediment is dispersed and the velocity is slowed down. The protection efficiency of this composite protection method is 82.2%, and can achieve the ideal protection effect.