The small grinding machine is suitable for the powder processing of more than 280 non flammable and non explosive materials in industries such as mining, chemical, building materials, metallurgy, etc., with a Mohs hardness of no more than 7 and humidity below 6%, including barite, calcite, potassium feldspar, talc, marble, limestone, ceramics, glass, etc. The particle size of the finished product can be adjusted freely within the range of 100-425 mesh.