Abstract: In view of the wide variety of equipment in the extrusion workshop, the communication methods of the equipment, and the data semantic format, the multi-source heterogeneous data cannot be collected uniformly. Taking the plastic extrusion production line as the research object, an extrusion production line based on OPC UA is proposed. Monitoring system information model. Using OPC UA information modeling theory, combined with the extrusion production line processing application scenario, the overall information model is abstracted, an extensible information model is established by defining type models and instantiated descriptions, and UaModeler is used to output a clear-structured visual information model and XML model description file. Map the generated XML file to the address space of the OPC UA server and use the OPC UA client tool UaExpert to connect the OPC UA server to test the OPC UA information model. The results show the correctness and feasibility of the instantiated information model of the extrusion production line constructed under the OPC UA framework, and the data information can be collected in a standardized way and communicated in a unified interface access way.