The utility model relates to a dust removing device for a reciprocating system of a tobacco manufacturing line tobacco cutter, and belongs to the technical field of tobacco equipment. The dust removing device comprises a dust collecting box beside a manual tool setting window of a headstock of the tobacco manufacturing line tobacco cutter. A cylindrical connecting pipe is arranged inside the tail end of the dust collecting box. The cross section of the dust collecting box is in a right trapezoid shape. Two holes are formed in the upper end face and the lower end face of the dust collecting box respectively, and the dust collecting box is fixed to the headstock through handle bolts. The cylindrical connecting pipe is welded to the outer side of the parallel wall of the tail end of the dust collecting box. The dust collecting box is arranged on the headstock, the dust produced when the tobacco cutter cuts tobacco leaves and dust produced when diamond grinds a grinding wheel can be left in a gap between a dustproof steel belt and a rack, and all components of the reciprocating system are prevented from being damaged.