Abstract: In order to realize interconnection of functions and information sharing between coal preparation plant operation and equipment management, the IoT-based remote monitoring technology is applied by the Tangshan Mine Coal Preparation Plant. The study of the functions of the system and the realization methods is made with the focus on four aspects-OPC data collection, equipment management and monitoring and control, visualization of operation state of equipment, and mobile management. Based on results of study, a set of IoT-based coal preparation plant operation and equipment information management system software and mobile App software are developed, making it possible to realize remote monitoring of coal washing processes. The system can also perform multiple management functions including, among others, equipment operation and fault management, and production data management (e. g. ash, oil consumption, quality of flotation product, etc.). Moreover, the key parameters like liquid level, concentration, ash, etc. in coal cleaning process and the information on equipment separation state (start/stop, fault, etc.) can be readily reviewed via mobile terminals, thus allowing the plant operation to be put under mobile and visualized management. Field application of the system shows that the use of the system can lead to overall enhancement of the informationization and intelligentization level of coal preparation plant, improvement of operation dispatching and coordination efficiency, reduction of failure rate and maintenance cost of equipment, and significant improvement of operating efficiency of coal preparation plant.