The invention discloses a convenient-to-move ladder for maintenance of electrical devices. The ladder comprises main ladder frame plates and auxiliary ladder frame plates connected to the upper ends of the main ladder frame plates, grooves are formed in the rear portions of the main ladder frame plates, the lower ends of the auxiliary ladder frame plates are connected into the grooves through pinrods, and a horizontal transverse plate is fixedly connected between the lower portions of the main ladder frame plates at the two sides; a threaded rod is screwed to the middle of the horizontal transverse plate, penetrates through the horizontal transverse plate and extends into a mobile wheel mounting plate, and mobile wheels are symmetrically installed at the two sides of the lower end of themobile wheel mounting plate. According to the convenient-to-move ladder, when the height of the electrical devices is large, after the auxiliary ladder frame plates are unfolded, the whole height of the ladder can be increased, and the ladder can be used for maintenance of most electrical devices different in height; the mobile wheels of the mobile wheel mounting plate extend out of the lower endsof the main ladder frame plates and are in contact with the ground, and in this way, the ladder can be moved through the mobile wheels under the push force effect.