The invention belongs to the technical field of ice-resistant units for offshore wind power foundations, and discloses a polyhedral ice-resistant unit suitable for a single-column three-pile type offshore wind power foundation. The wind power foundation is provided with a set of ice-resistant unit with a polyhedron structure, and the ice-resistant unit comprises a polyhedral inverted ice-resistant cone, connecting parts arranged between the foundation and the ice-resistant cone, an upper plane and a lower plane of the cone and conical surface steel plate reinforcing devices. After the ice-resistant cone is adopted, extrusion damage is converted into bending damage in the interaction of sea ice and the structure, so that the extreme static ice force and the structural ice-induced vibration borne by the offshore wind power foundation are effectively reduced, and the safe operation of the wind power structure is guaranteed; meanwhile, the polygonal cone adopts a plane steel plate splicing structure, so that the production-manufacturing and installing are convenient, the manufacturing cost is lower compared with a traditional circular-cone-shaped cone, and the economic performance of the offshore wind power structure is considered while the ice-resistant function is achieved; and the connecting reinforcing devices are arranged between every two adjacent contact planes of the polyhedral ice-resisting cone, so that the stability of the ice-resistant cone structure is enhanced.