PURPOSE: To eliminate limitation of a conveyor belt at a driven pulley in terms of space and to install a sub-conveyor for transporting full bobbin yarn.

CONSTITUTION: This conveyor belt driving device for transporting cop of fine spinning frame comprises a main body 1 of a driving device installed at one end of a conveyor belt 10 for a fine spinning frame, a sliding mechanism 2 movably laid in the longer direction of the conveyor belt 10 in the main body 1 of the driving device, a driving motor 4 rotating and driving a driving pulley 3 wound with the conveyor belt 10 attached to the sliding mechanism 2, a tension mechanism 5 which controls the position in the longer direction of the conveyor belt 10 of the driving pulley 3 wound with the conveyor belt 10 arranged between the sliding mechanism 2 and the main body 1 of the driving device and applies tension to the conveyor belt 10, and a fixing device 6 for fixing the sliding mechanism 2 whose position is controlled by the tension mechanism 5 to the main body 1 of the driving device. This fine spinning comprises frame the conveyor belt driving device.