The invention relates to a high-voltage iron tower fixing device, in particular to a novel L-shaped clamp which comprises a clamp body. The novel L-shaped clamp is characterized in that the clamp body is of an L-shaped structure, slot holes for fixation are formed in the two sides of the clamp body, a plurality of limiting protrusions matched with screw rods are arranged between the slot holes, clamping blocks are arranged at the two ends of the clamp body, the clamping blocks are independent and can move according to the positions of the screw rods, and the clamping blocks are provided with round holes matched with the screw rods. The novel L-shaped clamp of the structure has the advantages that fixation is firm, installation is flexible, and looseness and shifting are not liable to occur.