The utility model provides a transport vehicle. The transport vehicle comprises a vehicle body, a walking part and a driving device, wherein a mounting part for placing maintenance equipment is formedon the vehicle body; the walking part comprises two walking wheels arranged in the transverse direction of the vehicle body in a spaced mode, and the wheel faces of the two walking wheels are used for making contact with the top faces of two steel rails in a rail correspondingly. The walking wheels are rotationally connected to the vehicle body so as to drive the vehicle body to walk on the rail.The output end of the driving device is connected with at least one walking wheel, and the driving device is used for enabling the two walking wheels to move relatively in the transverse direction soas to change the distance between the two walking wheels. According to the transport cart, the distance between the two walking wheel supports can be changed to adapt to rails with different widths,the transport cart can walk on the rails to transport maintenance equipment into a tunnel, time and labor are saved, and the maintenance work efficiency is improved.