The utility model provides a tobacco grinder. The tobacco grinder comprises an outer shell, an inner shell and a box cover, the outer shell which is a cylindrical outer shell sleeves the outer periphery of the lower end of the inner shell which is a cylindrical inner shell, a step is arranged between the lower end and the upper end of the outer periphery of the inner shell, and the diameter of the upper end of the inner shell is larger than that of the outer shell. The cylindrical bottom face of the inner shell is externally provided with a plurality of upper tobacco grinding teeth, and the inner bottom face of the outer shell is provided with a plurality of lower tobacco grinding teeth correspondingly. A plurality of L-shaped lock catches are uniformly distributed on the outer side wall of an opening of the outer shell, the upper edge of a long side of each L-shaped lock catch and the end face of the opening of the outer shell are positioned on a same surface, and the lower edge of the long side of each L-shaped lock catch is provided with a notch. Compared with a traditional tobacco grinder, the tobacco grinder has the advantages that due to the fact that a storage function is added, tobacco shreds can be ground and stored in the tobacco grinder, more tobacco shreds can be processed once in free time and stored in a storage device, and accordingly damp proofing is realized while the tobacco shreds can be stored for a long time to make it convenient for use; further, the tobacco grinder has the advantages of simple structure, portability and the like.