Rail type seat elevator capable of rising along stair railing

The invention discloses a rail type seat elevator capable of rising along a stair railing. The rail type seat elevator comprises a stair body, an upper rail, a middle rail, a ground rail and a telescopic sliding connecting assembly. The stair body comprises stair steps, protection rods are arranged on one sides of the upper surfaces of the stair steps, and the stair railing is arranged between theupper ends of the protection rods. The upper rail is arranged in the middle of the outer side of the stair railing, the middle rail is arranged below the inner side of the stair railing, and two conveying assemblies are arranged in the middle rail. Spring columns and sliding blocks are connected with a gravity stabilizing sliding rail, a foldable seat assembly and the ground can be kept perpendicular all the time, and convenience is provided for people. According to the rail type seat elevator capable of rising along the stair railing, the problem of turning of a foldable seat elevator can beeffectively solved, and t