The work aims to improve the running speed control accuracy of film packaging material of vertical packaging machine and enhance the bag length precision and bag shape appearance quality of the packaging bag. The factors affecting the accuracy of the constant speed control of packaging materials of vertical packaging machine were analyzed. Based on that, an adaptive fuzzy PID control strategy was proposed, so as to achieve the on-line adjustment and optimization of the system parameters, thus realizing the on-line regulation of the speed of the packaging materials. At the same time, the control system of the vertical packaging machine was established based on PLC. The hardware structure and software design method of the control system were introduced. The experimental results showed that the packaging accuracy of the proposed control method was about ±0.1 mm, which could effectively improve the feeding speed accuracy of the packaging material and control the speed error within the allowable range. The control system realizes the precise control of the feeding speed of the packaging material, and improves the bag length precision and the bag shape quality.