Abstract: In view of the disadvantages of the heavy medium adding system, such as low intelligence level and large amount of manual labor, the Lijiahao coal preparation plant has made full use of the existing technology to transform the adding medium system and developed the intelligent adding medium system, by installing the necessary instruments for the intelligent dielectric addition, the surface identification of the dielectric heap and the intelligent positioning system for the medium point are designed and applied, and the optimal predictive model and intelligent control strategy are established by comparing different modeling algorithms, an automatic control system for the mixing process of medium and water is developed, and the whole process of intelligent adding medium is explored. The problems of large workload, high labor intensity and low work efficiency of heavy medium addition in coal preparation plant are solved. The daily, monthly and annual statistics of magnetite powder addition are realized precisely, and the intelligent level of coal preparation plant is improved.