The production line of a super capacitor is a complex production line, and so many factors need to be considered during the designing process. In this paper, the plant simulation software of Siemens company is used to simulate the super capacitor production line, to verify the rationality of the application of digital twin technology in the complex production line designing process. Using the approximate parameters to study the influence of Automated Guided Vehicle (AGV) characteristics on the production line. Simulation in software environment can well demonstrate the actual production process. It is convenient to model the production line in the software environment. The malfunction and other factors in the actual production process can be replaced in software as the failure rate in the simulation environment. Data statistics and other functions can directly see the changes in various parameters in the production line, to get a better optimization scheme. The changes in actual can be "copied" to the simulating process, which will make benefit in establishing a production line.