The invention provides a climbing ladder for an electrician in indoor maintenance, belonging to the field of electric power. The climbing ladder comprises a single ladder body; the single ladder bodyis formed by fixed connection of a U-shaped frame with a downward opening and climbing rods transversely fixed between the left and right side frames of the U-shaped frame from top to bottom; the front side of the lower end of the single ladder body is horizontally provided with a supporting plate; two ends of the rear side edge of the upper end surface of the supporting plate are connected with the lower end tips of the left and right side frames of the single ladder body via hinges; and the width, from front to back, of the supporting plate is half the total length of the single ladder body.With the single ladder body provided by the invention, the electrician can conveniently climb to a high place to carry out maintenance and wiring; antiskid screw threads are used for increasing the frictional force of the sidewalls of the climbing rods of the single ladder body, so the electrician is protected from skidding during climbing; telescopic rods rotate back and forth according to the adjusted inclination position of the single ladder body until vertical positions are reached and the telescopic rods extend by corresponding length, so the lower end tips of the telescopic rods butt against the supporting plate located below the telescopic rods and support the single ladder body in the inclination position, thereby facilitating climbing of the electrician to a high place without supporting of a wall.