Abstract: For problems that loading value is not accurate, overloading or loss of load usually happens in railway loading system by use of manual or semi-automatic control method in coal mine, the paper introduced a design scheme of automatic control system of railway loading based on PLC and upper computer. The control system adopts S7 series PLC as controller to control winch of railway, coal feeder and belt conveyor, and can send data to upper computer to complete and monitor operation of the whole loading system.