The invention provides a method for improving the tobacco shred preparing quality stability. The method specifically includes the steps of material putting, primary moisture regaining, stored leaf preparing, secondary moisture regaining, stored leaf distributing, shredding, moisture controlling, shred drying, mixing, flavoring and storing. The moisture controlling process is added after shredding,so the problems that due to the long process route, the material process water content is greatly influenced by the environment temperature and humidity and the shred drying inlet water content of different batches fluctuates obviously are solved, the incoming material water content of the shred drying process is stabilized, the stability of the water content of different batches of materials entering the shred drying process is ensured, the shred drying machine outlet material water content meets the processing requirement, and therefore the processing intensity and dewatering amount of theshred drying process of different batches are stabilized, and the stability of the sensory quality of shred drying outlet materials is ensured; compared with other methods, the method has the advantages of being small in technological change, small in refitting investment, capable of saving energy and reducing consumption and free of newly constructing or refitting of a factory.