The utility model provides an otter board auxiliary driving means is carried to smoked sheet roast machine again, the setting is on the driven shaft of tail transport otter board is baked again to the smoked sheet, including gear motor, driving sprocket, automatic tensioning ware, the otter board sprocket, such as clutches, otter board chain driven shaft and otter board chain, set up freewheel clutch on gear motor's power output shaft, gear motor passes through freewheel clutch and is connected with driving sprocket, driving sprocket passes through the otter board chain and is connected with the otter board sprocket, otter board sprocket installation is on otter board chain driven shaft, the utility model discloses an auxiliary drive effect is showing, the practicality, and the action is sensitive, stable, and control is reliable, and the purpose that reaches synchro -driven that can furthest is stopped to reduce the non - fair wear and tear and the damage of spare part because carry the intermittent type of chain to pause or the wriggling leads to the fact the emergence of the frequent trouble of equipment, greatly reduces spare part consumption and manufacturing cost.