Quartz tube expanding machine with supporting device

The utility model provides a quartz tube expanding machine with a supporting device. The quartz tube expanding machine comprises a machine tool; the rotating spindles are oppositely arranged at two ends of the machine tool; the blowtorch is arranged between the two rotating spindles; the supporting device comprises a base which is arranged below the pipe and moves in the axial direction of the pipe; the central positioning part is arranged at the top end of the base; the height adjusting part is arranged at the top end of the central positioning part and is used for adjusting the height of the graphite wheel part; and the graphite wheel part comprises two graphite wheels which are respectively arranged on two mutually parallel fixed shafts, and the fixed shafts are the same in axial position of the pipe and are axially parallel to the pipe. According to the utility model, deviation and jumping of the pipe due to the influence of centrifugal force generated by high-speed rotation, wall thickness, roundness and