The invention provides a special ladder for a power distribution pole and tower signboard. The special ladder comprises a main support pole and a plurality of transverse beams and is characterized in that the transverse beams are in two columns; the upper surface of each transverse beam is provided with a groove; the upper part of the main support pole is provided with an arc-shaped plate; the bottom of the main support pole is provided with a base; two seat plates of the base are symmetrically positioned at the two sides of the main support pole and are vertical to the transverse beams; one end of each seat plate is hinged to a corresponding lug plate arranged at the bottom end of the main support pole; the other end of each seat plate is provided with a through hole; a screw bolt is arranged in each through hole; the smooth section of each screw bolt is positioned between a threaded section and a conical section; each screw bolt passes through the corresponding through hole formed in the seat plate; a fastening screw nut is assembled on each threaded section; each fastening screw nut is tightly pressed on the upper surface of the corresponding seat plate; each screw bolt is provided with an inner hole; a ground screw passes through each inner hole; the bottom end of each ground screw is in a conical shape and is exposed out of the conical section of the corresponding screw bolt; the length of the ground screws is greater than the length of the screw bolts; a bottom fixing pole is arranged on the main support pole in a hinging way; and the other end of the bottom fixing pole is fixedly connected with a hoop. The special ladder has the advantages that the holding by people is not needed, and the self fixation is realized, so that the labor is saved; shaking cannot occur; and the safety is high.