In the process of metallographic specimen preparation, grinding and polishing of the specimen are essential procedures. After grinding and polishing, the specimen can obtain a mirror-like surface. The MP-2B metallographic specimen grinding and polishing machine adopts a frequency converter speed regulation, which can make the speed of the grinding and polishing disc infinitely adjustable between 50-1000r/min. By replacing the metallographic sandpaper and polishing fabric, the grinding and polishing process of the specimen can be completed, showing a wider range of applicability. The double-disc design allows two people to operate at the same time. The shell adopts overall blister technology, with a novel appearance, stable rotation, low noise, easy operation, high work efficiency, etc. It also has a built-in cooling device, which can cool the specimen during grinding and polishing to prevent the metallographic structure from being destroyed due to overheating of the specimen. It is suitable for metallographic laboratories in factories, colleges and universities, and scientific research institutions. It is an excellent equipment for grinding and polishing metallographic specimens.