The invention relates to a driving mechanism of a track-type transporting vehicle, which belongs to the technical field of logistics equipment and machines, in particular to a device for driving, steering and track-changing of the track-type transporting vehicle, the device consists of a support frame unit, a driving unit and a follow-up unit, the driving unit and the follow-up unit are connected together by the support frame unit, a support bearing of the driving unit and the support bearing of the follow-up unit are arranged in an upper longitudinal beam and a lower longitudinal beam of the support frame unit respectively, rotary shafts are arranged at the upper end and the lower end of a driving frame respectively, the follow-up unit consists of two walking wheels, four guiding wheels, a follow-up mounting frame and a track selecting device with four guide wheels, the four guiding wheels are mounted at four corners of the driving mounting frame respectively, the walking wheels and the track selecting device are mounted on the follow-up mounting frame and connected with the support bearing of the follow-up unit in the upper longitudinal beam and the lower longitudinal beam in the support frame unit through the rotary shafts, and the two walking wheels of the follow-up unit and the two walking wheels of the driving unit constitute four wheels of the transporting vehicle. The driving mechanism of the track-type transporting vehicle has simple and practical structure.