The invention belongs to the field of tobacco machining technology, and particularly relates to a device for adjusting uniformity of size of cut tobacco. The device for adjusting uniformity of the size of cut tobacco comprises a feeding jigging conveyer, material baffles, cut tobacco fluffing roller, a flow deflector, a fine-toothed comb, a high speed rotor, a low speed rotor and a frame which are divided into a cut tobacco loosing unit, an cut tobacco impurity removing unit and cut tobacco uniformity adjusting unit. The device for adjusting uniformity of the size of cut tobacco is simple in structure, reasonable in design, flexible and convenient to mount and use, and the device is easy to implement based on the present cut tobacco manufacturing technology and device. The structure of the device is convenient to adjust, and the device is good in adaptability, low in maintenance cost, good in technical effect, and low in influence on breakage of cut tobacco. A shear type filament cutting technology is adopted by the device, the contact area between a mechanical device and cut tobacco is small, the tearing force is small, the machining strength is reduced, breakage of cut tobacco is less while the uniformity of the size of cut tobacco is distinctly adjusted, no extra breakage rate is added, a good technical effect is achieved.