The utility model discloses a power transmission tower frame, which comprises a plurality of principal materials, a plurality of transverse materials and a plurality of inclined materials, wherein a plurality of principal materials, a plurality of transverse materials and a plurality of inclined materials are connected in a staggered mode to form a frame structure; a plurality of panel points are formed on the principal materials; the power transmission tower frame is provided with a plurality of reinforcing units; each reinforcing unit comprises a plurality of reinforcing transverse materials and a plurality of reinforcing inclined materials; a plurality of reinforcing transverse materials are connected with the panel points on the same plane to form a transverse partition surface; a plurality of reinforcing inclined materials form an inclined strut surface; and the inclined strut surface is connected with surfaces of the inclined materials and is connected with the panel joints. According to the power transmission tower frame, the reinforcing units are arranged on the original power transmission tower frame by utilizing panel joint plates and bolt holes at the panel joints on the original power transmission tower frame without the damage of the original power transmission tower frame, and the reinforcing units and the original power transmission tower frame form a whole; and the power transmission tower frame is good in wind-resistant effect, simple in structure, convenient to install, short in construction period and low in cost, and is suitable to be popularized and applied in large range.