For the problems of information integration and equipment interconnection and interoperability caused by different interface protocols of multiple heterogeneous devices and different semantics of multi-source heterogeneous data in machining workshop of machine tool manufacturing,an industrial robot monitoring system integrating OPC UA information model and OPC UA data communication was proposed based on OPC unified architecture (OPC UA).The modeling process was given,and core technologies such as OPC UA specification,nodes and references were used to design an abstract robot common information model,private component models were decomposed and summarized.OPC UA servers and clients were built with modular design.Server address space mapping,OPC UA communication and other technologies were integrated to handle heterogeneous data in order to provide normalized data and standardized data communication.A typical brake disc flexible manufacturing cell (FMC) was selected for field application,and the information model was applied to the loading and unloading robot monitoring system.The application results show that the robot data format and data operation are unified,and the designed OPC UA information model can meet the practical application requirements of the loading and unloading robot monitoring system.Thus the completeness and practicality of the information model and the feasibility of the proposed framework are verified.