The invention relates to a semi-submersible high-power offshore floating type
wind power platform with flat lower floating bodies, which comprises a fan and a
tower drum arranged at one end of the
tower drum. The platform further comprises a platform body, a
mooring cable and an anchoring foundation. The platform body is connected with the anchoring foundation and positioned through the
mooring cable. The platform body comprises a plurality of stand columns, a plurality of lower floating bodies and a plurality of upper supporting rods. The lower floating bodies are in
butt joint to form a polygonal structure, the stand columns are installed on the surfaces of the lower floating bodies and located at the vertexes of the polygonal structure, the upper supporting rods are arranged along the side lines of the polygonal structure and connected between the adjacent stand columns, and the other end of the
tower drum is connected with any one stand column. The floating type
wind power platformis simple in structure, the wave area of the stand columns is small, the flat lower floating bodies are located at the deep position below the water surface, the
wave force borne by the body is small, movement of the platform in
waves can be reduced, and the
wave resistance of the floating type
wind power platform is improved. Due to the fact that no supporting rod structure exists
underwater, fatigue nodes are few, and maintenance of the platform structure is facilitated.