In order to improve the efficiency and quality of the production line, a virtual twin model of automatic packing line was proposed. According to the sequence of physical packing and its process flow, 3D model construction of virtual packing line and twin data, the specific model needed by the digital twin of the packing line was designed. As well as the location and content of the twin data acquisition, the way of data acquisition and transmission of the physical packing line, the way of data transmission and analysis to the virtual packing line model, and so on, and the application effect of the digital twin model in the actual packing line is summarized and analyzed. The method can realize the real-time monitoring and detection of the production process of the solid packing line, and modify and optimize the existing packing line according to the detection results.