Abstract: The use of conventional control box in coal preparation plant usually involves a series of problems,such as high wiring cost,easy wearing out of mechanical buttons,high fault rate of a large number of switch-over points,simplistic function of display elements on front panel and the large space required for installation of the box.To overcome these problems,a terminal intelligent control box is specifically designed and developed.The use of the control box makes it possible for the operators on site to realize exchange of data with PLC,sensing elements and intelligent devices via tablet computer.Thus,the outdated control mode of hard-wired interconnection between control box and electrical equipment can be finally replaced,and,instead,all the data collected during operation of the plants can be centrally displayed at each work post,enabling the control box to perform multifarious control functions and realize real-time sharing of overall plant information.