Compared with the processing of wood pulp,straw pulp and other short fiber grinding machine,with flax fiber,cotton wool and other main processing materials,the long fiber grinding machine naturally has more stringent production conditions. In order to improve the equipment adaptability of the long fiber refiner,a PLC control system for the long fiber refiner is designed based on the automatic perspective. This system adds a pulse controller on the basis of the traditional PLC control system,which can help the refiner to quickly start the grinding state and quickly switch from the short fiber refiner state to the long fiber refiner state. Compared with the traditional grinding machine,it has more significant advantages in work efficiency and equipment adaptability.