During the palletizing process of fertilizer bags, traditional operation modes such as manual handling and the use of dedicated palletizing equipment have problems such as difficulty in ensuring the consistency of stack shapes, poor structural stability and low operation efficiency. To solve these problems, an intelligent stacking system for fertilizer bags was designed using Siemens’S7-1215C DC/DC/DC PLC as the core controller. As the actuator, the industrial robot is equipped with a specially designed fertilizer bag holders at its end, which is responsible for grasping and stacking the fertilizer bags. The PLC is connected to the Fanuc M-410iB/140H industrial robot and the Hikvision vision unit through the Profinet communication mode. After the sealing machine seals the filled fertilizer bags, the visual unit is responsible for intelligently identifying the types of fertilizer bags on the conveyor belt and positioning them in real time. The industrial robot grabs the fertilizer bags based on the coordinates sent by the visual unit and precisely stacks them according to the stack shape instructed by the upper computer. The results show that this system has successfully realized the functions of automatic transmission, visual recognition and positioning, automatic grasping and palletizing by stack type of fertilizer bags. The system has the advantages of fast stacking speed, good palletizing quality and stable operation, significantly improving the level of equipment automation. It plays an important role in promoting the realization of automated production of fertilizer bag packaging in fertilizer production enterprises.