A crawling ladder for automatic power-distribution overhauling comprises a first-section crawling ladder, a second-section crawling ladder and a supporting mechanism, wherein a sliding way is arranged on the upper-half inner side of the first-section crawling ladder, the second-section crawling ladder can vertically slide in the sliding way, and fixing of the second-section crawling ladder in the sliding way is achieved through a sliding way locking part installed on the first-section crawling ladder. The supporting mechanism comprises an H-shaped supporting arm, wherein one end of the supporting arm is hinged to the crawling ladder cross beam at the upmost end of the second-section crawling ladder, a fixing rack is hinged to two sides of the second crawling ladder cross beam at the upper end of the second-section crawling ladder respectively, multiple grooves are formed in the upper-half portions of the fixing racks at intervals, the cross rod on the supporting arm is clamped in the grooves of the fixing racks at a preset angle, the supporting angle of the supporting arm is fixed through a locking screw, and accordingly a stable triangular structure is formed. The crawling ladder can fully achieve climbing usage for automatic power-distribution overhauling, can be also folded and put away and is convenient to carry, and the working efficiency of overhauling operation can be greatly improved.