The invention relates to an offshore wind turbine rock-socketed foundation suitable for a batholithic seabed and a construction method of the offshore wind turbine rock-socketed foundation. The offshore wind turbine rock-socketed foundation comprises multiple inclined steel pipe piles which are uniformly distributed circumferentially, the lower ends of the inclined steel pipe piles are embedded in the seabed while the upper ends of the same jointly support a concrete bearing platform and are inserted into and fixedly connected with the same, a wind turbine tower barrel is mounted above the concrete bearing platform, a concrete core pile is arranged in each steel pipe pile, and the lower end of each concrete core pile penetrates out of the lower end of the corresponding steel pipe pile and is embedded in the seabed. By the construction method, construction process is simplified, construction period is shortened, and investment is saved; the structure is higher in overall economical efficiency, and the offshore wind turbine rock-socketed foundation has a wide application prospect in offshore wind power generation engineering.