The multi-functional tea packing machine has the problems of poor packing, appearance folding and material burning and so on. The control system of tea packaging machine based on SIEMENS S7-1200 CPU and TIA Portal is developed. A seal temperature control system of multi-function packaging machine based on Fuzzy-PID control algorithm is designed. Firstly, the working principle, hardware selection and communication network configuration of multi-functional tea packing machine are introduced. Secondly, complete the hardware configuration of the packaging machine control system in the TIA Portal V13 environment and Fuzzy- PID control algorithm is implemented based on OPC technology. Finally, the man-machine interface design of the control system is completed. Field operation shows that the temperature control deviation is ±1.8 ℃ and the accuracy is less than 1.5%. The application shows that the multifunctional tea packing machine system runs stably and has high rate of finished products.