Offshore wind turbine generator set submarine cable connection device and connection method

The invention relates to an offshore wind turbine generator set submarine cable connection device and connection method. A circular arc-shaped structure is welded on a tower drum, and a reinforcing plate with a submarine cable hole is arranged on the circular arc-shaped structure. The diameter of the submarine cable hole is 2-3mm larger than the diameter of a submarine cable and a protection pipe thereof and upwards tilts 20 to 70 degrees along a direction from an outer wall to an inner wall. The submarine cable and the protection pipe thereof are connected to a wind turbine through the submarine cable hole in the reinforcing plate, and a gap in the submarine cable hole is sealed after the submarine cable is well connected. Compared with a conventional submarine cable connection method of embedding a submarine cable pipeline in a wind turbine concrete foundation and connecting the submarine cable to the wind turbine from the bottom of the wind turbine through the submarine cable pipeline, the influence of the embedded submarine cable pipeline on the strength of the concrete foundation is avoided, and the structure is simple, the site construction difficulty is small, the set sealing performance is good, the construction efficiency of the offshore wind turbine submarine cable can be effectively improved and the construction cost is reduced.