The utility model relates to a ladder special for overhauling. The ladder consists of a main ladder frame, positioning frames and a bottom corner pressure plate, and is characterized in that: two positioning frames are fixedly connected with ladder pipes on both sides of the main ladder frame in a lower direction respectively; and the lower end of the main ladder frame is fixedly connected with the bottom corner pressure plate. The ladder has the advantages of firm connection, reliable connection with a switching mechanism, high stability after fixing, small size, light weight, easiness for operating, simple structure, short connecting time and convenience for binding a safety belt. The problem that a safety belt for working personnel cannot be hung during operation is solved, the situation of low-altitude suspension for high-altitude use and high-altitude falling accidents are prevented, and the operation safety of overhauling personnel is enhanced; and the problems of high workload and high risk of a step ladder for use in climbing operation are solved, working quality is enhanced, labor intensity is lowered, and an operation field is standardized.