A traveling roller includes a left roller, a right roller, a support shaft, a driving device and a sealing device, wherein the traveling roller may also include an intermediate roller; the support shaft is provided on an axis of the left and right rollers; inner walls of the left and right rollers are respectively connected to support plates; an outer ring of each of the support plates is provided with a notch for dust to flow out; the driving device includes an outer rotor motor sleeved on the support shaft; transmission devices are provided between two end cap seats of a rotor body of the outer rotor motor and the support plates; pawl members of the transmission devices are fixedly sleeved on the end cap seats, or driving planetary gears of the transmission devices are fixed to the rotor body.