Abstract: According to problem of low-degree automation for natural rubber drying production at present，electrical auto-control system of transport rubber process for rubber drying production line was designed based on PLC （Programmable Logic Controller，PLC）.Diagrams of electrical components layout and control process flow chart were given based on transport rubber process for rubber drying production line.The given design scheme included main circuit and control circuit in detail.Control circuits included external connection diagram of PLC，input and output address allocation，sequence function chart （SFC） of PLC，etc.On the basis of test，the operation of electrical control system was smoothly，electrical control system was contented with requirements of production process.The conclusion was presented that design of electrical control system was reasonable and high automatic，and it could be used in practical natural rubber production.