Abstract: Aiming at the current situation that the main drainage system in coal mine is of backward technology level,high failure rate and low degree in reliability,a kind of automatic monitoring and control system for the main drainage system in coal mine based on PLC(Programmable Logic Controller)and computer control technology has been developed.Compiled the field control and ground remote monitoring in one set,the system can realize data acquisition,real-time monitoring and control,together with fault warning,etc..In this paper,the overall structure,software and hardware design are put forward.Test debugging of the system is carried out in laboratory and field,and the system has been put forward to the industry application.It has been shown by the laboratory test and field application that the system can operate stably and reliably,and improve the management model of the main drainage system in coal mine effectively,as well as promote the productivity.In addition,it can realize unmanned or less humanization operation in central pump station.