Abstract: Flocculant preparation and dosing system is an indispensable system in coal preparation plant, its main function is to purify sewage, realize solid-liquid separation, and play an effect of reuse and water saving. With the continuous expansion of the scale of coal preparation plant, the demand and utilization of water resources are also increasing. In order to realize the recycling of sewage, achieve the effect of zero discharge of sewage, reduce the labor intensity of workers, coal preparation plant urgently needs a flocculant preparation and dosing system. Based on this, after years of research for flocculant characteristics, combined with the advantages of domestic and foreign equipment, BGRIMM has used the latest control algorithm and technology, developed a flocculant preparation and dosing system. After the system is put into use in the coal preparation plant for one year, it is highly praised because of its simple operation, small maintenance, the flocculant is prepared to meet the production requirements, and the ability to realize remote control, etc., which better solves the problem of sewage treatment in the dense pool of a large coal preparation plant, and brought significant economic benefits to the coal preparation plant. The successful application of this system in coal preparation plant has laid a foundation for the industrialization and popularization of this product.