Disclosed is a tire driving supporting device. A driving motor and a driving wheel are connected by adopting a transition shaft mechanism. The transition shaft mechanism comprises a fixing sleeve, a central spindle, a bearing outer sleeve and a transition connecting sleeve; the central spindle is coaxially connected with an output shaft of the driving motor, the fixing sleeve is a hollow sleeve, the central spindle is coaxially sleeved with the fixing sleeve, one end of the fixing sleeve is fixed to a shell of the driving motor, a first bearing is arranged between the fixing sleeve and the central spindle, the fixing sleeve is sleeved with the bearing outer sleeve, a second bearing is arranged between the bearing outer sleeve and the fixing sleeve, the outer wall of the bearing outer sleeve extends to the outer side in the radial direction to be fixedly connected with a spoke of the driving wheel, the transition connecting sleeve is further arranged at the end, away from the driving motor, of the bearing outer sleeve, and the transition connecting sleeve is installed on the central spindle by adopting key connection and is connected with the bearing outer sleeve in the axial direction. Under the condition of regular torque transmission, pressure borne by a tire can be transmitted to the shell of the driving motor instead of being transmitted to the output shaft of the driving motor, and the service life of the driving motor is prolonged.