The utility model relates to a batter post foundation structure for an overhead transmission line. The batter post foundation structure comprises insertion angle steel, anchoring angle steel, a concrete pile and a foundation step pile, wherein the insertion angle steel and the anchoring angle steel are respectively and fixedly installed at the upper portion and the lower portion of the concrete pile, the concrete pile forms an included angle of 10 degrees to 20 degrees with the vertical direction, and the foundation step pile is arranged at the bottom of the concrete pile and in pouring connection with the concrete pile. Compared with the prior art, the inclination of the batter post foundation structure is identical with the gradient of a transmission line support, greatly improves stress conditions of foundation columns and base plates, enables effects of foundation horizontal force on the foundation base plates to be reduced to the minimum degree, and obviously improves foundation stability. Simultaneously, eccentric bending moment is reduced, the size of controlled foundation base plates can be correspondingly reduce, concrete amount and reinforcement amount of foundation can be further reduced, the foundation is reasonably stressed, overturning stability is greatly improved, and using amount of base materials can be saved about 20%.