Abstract: A grinding device for medical waste includes a driving device, a hollow housing, a shaft vertically journalled in the housing driven by the driving device. A first bowl-shaped grinding container is coaxially provided in the housing with respect to the shaft, and includes a first wall having a plurality of through holes. A first cutting blade extends radially inward from the first wall. A second cutting blade is transversely provided above the first cutting blade and is adjustably mounted on the housing. The second cutting blade is cooperatively associated with the first cutting blade. A second bowl-shaped grinding container is coaxially provided in the housing, with respective to the shaft, around the first grinding container. The second grinding container has a second wall with a plurality of through holes. A third cutting blade extends downward from a radial inward flange on the second wall.