The invention discloses a device for preventing material deposit for a tobacco carbon dioxide expanded cut tobacco line transporting groove and aims at eliminating a material deposit region above an overturning door shaft of a discharging tank. With adoption of the device, dry ice cut tobaccos discharged by an impregnator can smoothly enter an opening device through the transporting groove. The device has the characteristics of being simple in structure, convenient to disassemble and assemble, low in cost and free of maintenance, lightens the labor strength of an operator and has the key of ensuring that dry ice in the dry ice cut tobaccos is not sublimated before entering a sublimation tube, and thus the expansion rate of the dry ice cut tobaccos is effectively ensured.