Abstract: In view of the need of intelligent and automatic coal production, this paper selects S7-300 PLC and iFIX 5.5 configuration software to form an intelligent control system, and successfully applied to the control system of belt conveyor in Zhaogu No. 2 Coal Mine.Considering the loss of power caused by the continuous maintenance of the conveyor while the belt conveyor is transporting coal, the theory of fuzzy control is introduced, and the PLC is used as a fuzzy controller to match the belt speed with the coal flow.The results show that the system can not only realize the needs of intelligent monitoring of Zhaogu No. 2 Coal Mine, but also effectively save energy and improve production efficiency.