BMP-25 metallographic sample grinding machine is suitable for wet grinding, dry grinding, grinding and other processes of sample. Equipped with diamond correction knife, it can smooth the surface of grinding wheel and improve the utilization rate of grinding wheel. Equipped with water supply system, with easy to operate, safe and reliable, easy maintenance and other advantages, suitable for all kinds of materials grinding work. After cutting the surface of the sample or the surface of the unprocessed sample is rough and uneven, in order to improve the quality and efficiency of the sample preparation, the sample can be ground on the machine before pre-grinding and polishing work.