Variable-cross-section three-stand-column offshore floating type wind power foundation

The invention belongs to the technical field of ocean engineering, and provides a variable-cross-section three-stand-column type offshore floating wind power foundation which comprises a bottom structure, a center stand column arranged on the bottom structure and a plurality of circumferential stand columns arranged on the bottom structure around the center stand column. Contact sections intersecting with the water surface are arranged on the circumferential stand columns, the sectional area of the middle of each contact section is smaller than the sectional areas of the tail ends of the two ends of the contact section in the axial direction of the circumferential stand columns, and the sectional areas of the contact sections are gradually increased from the middle to the tail ends of the two ends. According to the floating type wind power foundation, the wave load and dynamic response of waves to the floating wind power foundation can be effectively reduced, and the seakeeping and power generation benefits o