Bulldozer and driving device thereof

The invention discloses a bulldozer and a driving device of the bulldozer. The driving device comprises a first motor assembly, a second motor assembly and a control unit, the first motor assembly drives two crawler wheels, the second motor assembly drives two crawler wheels, and the rated power of the second motor assembly is larger than that of the first motor assembly. The control unit controls the first motor assembly and/or the second motor assembly to output power or cut off power output. According to the driving device of the bulldozer, the first motor assembly and/or the second motor assembly can be selected as a power source according to the working condition of the bulldozer, it is guaranteed that the first motor assembly and the second motor assembly work in an efficient area, the work efficiency of the first motor assembly and the second motor assembly can be improved, and the service life of the first motor assembly and the second motor assembly can be prolonged.