The invention discloses a base of a wind power foundation. The base comprises a limiting ring, three guide rail supporting frames, an installation base and a fixation base, wherein the upper end of each guide rail supporting frame is welded with the limiting ring with the included angle of 120 DEG; the lower end of the guide rail supporting frame is welded to the middle part of the fixation base; the fixation base is installed on the ground in a matched manner; the installation base is movably embedded into the inner side of the guide rail supporting frame; and the installation base is installed on the wind power foundation by threads. The base of the wind power foundation disclosed by the invention is characterized in that the wind power foundation is installed on the base in a matched manner via the installation base; and the installation base can slide up and down on the guide rail supporting frames and is flexibly installed on the guide rail supporting frames because of gravity of the wind power foundation, and the fixation base is firmly installed on the ground, so that installation stability is ensured.