Abstract: This utility patent is a multi-purpose solid material grinder. It includes a shell. The interior space of shell is divided into two or more than two chambers. Each chamber has its own container chamber and grinding set. On the shell of each chamber there is inlet hole and outlet hole for each container chamber. In the shell there is also a motion changing set that will drives every grinding unit's grinding driving axis to operate, and a driving set that will drives the motion changing set to pass the motion to the motion units. By separating the interior of the shell into several grinding chambers, and put containing chamber and grinding mechanism inside each grinding chamber separately, the grinder contains several independent grinding system, which can grind different solid materials. And by engaging the motion changing set, different grinding systems share a driving unit that have one power input. Thus it is very convenient.