Digital twin can simulate and monitor the state and behavior of physical entities in the real world, helping enterprises to better understand and manage real-world physical systems, improve production efficiency, reduce costs, and improve safety and reliability. In this paper, we use GTS motion control card and Unity engine to build a digital twin system, and control a virtual industrial automation handling platform including two screw servo axes and multiple sensors through the physical GTS motion control card. The control card program controls the motion of the virtual model through transmission control protocol (TCP) communication, and the virtual model system feeds back the signal to the control card program to achieve the virtual and real synchronous digital twin effect. The digital twin system uses Unity engine to create a highly realistic virtual environment, and can run on multi-platform terminals.