Boarding ladder for special vehicle

The invention discloses a boarding ladder for a special vehicle. The boarding ladder comprises a sliding rail, a horizontal sliding frame, a ladder plate frame, a fixed step plate fixedly installed onthe horizontal sliding frame, a movable step plate hinged to the ladder plate frame, a diagonal draw bar hinged to the other side of the movable step plate and a foot plate hinged to one end of the ladder plate frame. The other end of the ladder plate frame is hinged to the horizontal sliding frame; bearings are installed at the two sides of the horizontal sliding frame and the two sides of the ladder plate frame respectively, the horizontal sliding frame and the ladder plate frame are arranged in the sliding rails in a sliding fit mode through the bearings, the diagonal draw bar is arrangedin the inner side of the ladder plate frame, a sliding groove is formed in the horizontal sliding frame, and the upper end of the diagonal draw bar is arranged in the sliding groove in a sliding fit mode through a sliding bloc