The micro-fiber mill is upgraded and optimized on the basis of the traditional high-low concentration pulping machine. It is the most basic pulping equipment used in the field of pulping and research in the pulp and paper industry. It can make wood chips, bamboo and straw into pulp, and can also deeply grind chemical pulp, chemical mechanical pulp, mechanical pulp, waste pulp and so on to change the surface characteristics of the fiber. High concentration pulp grinding mechanism pulp is a more advanced pulping tool used in the world.