The present invention relates to a base structure for an off-shore wind turbine, comprising at least multiple foundation piles and at least one bearing structure for accommodating the tower of the wind turbine, wherein each base pile is provided with a driven pile leading the inner portion of the base pile and used for anchoring in seabed, and the bearing structure connects the upper ends of the base pile. The base structure is characterized in that the foundation piles (2,3,4) and the driven piles (11,12,13) have an overlapping area in the preset longitudinal section, in the overlapping area (25) of the piles, the gap (29) of the piles, and the cross section of the hollow inner portion of the piles (2,3,4,11,12,13) in partial sections below and above the overlapping area (25) are filled with filling material (30) to be hardened.