The invention discloses a sliding-type tire-supporting device for a tire bead of a vehicle tire. The sliding-type tire-supporting device is characterized in that the sliding-type tire-supporting device comprises a sliding shaft assembly, a sliding sleeve assembly, a longitudinal supporting frame, a transverse supporting frame, bearings, a screw rod assembly, a coupling, a coupling frame, a guard plate and a manual rotating tool; the sliding sleeve assembly is mounted on the sliding shaft assembly, and the longitudinal supporting frame and the transverse supporting frame are correspondingly mounted on the two sides of cross beams of both the sliding shaft assembly and the sliding sleeve assembly; the bearings are mounted on the longitudinal supporting frame and the transverse supporting frame; and the coupling is mounted in the coupling frame, the coupling frame is mounted on the cross beam of the sliding shaft assembly, and the guard plate is mounted at the end, close to the coupling,of the sliding shaft assembly.