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Abstract: The integration of the industrial Internet, cloud computing, and big data technology is changing the business and management mode of the industry chain. However, the industry chain is characterized by a wide range of fields, complex environment, and many factors, which creates a challenge for efficient integration and leveraging of industrial big data. Aiming at the integration of the physical space and virtual space of the current industry chain, this paper proposes an industry chain digital twin (DT) system framework for the industrial Internet. In addition, an industry chain information model based on a knowledge graph (KG) is proposed to integrate complex and heterogeneous industry chain data and extract industrial knowledge. First, the ontology of the industry chain is established, and an entity alignment method based on scientific and technological achievements is proposed. Second, the bidirectional encoder representations from transformers (BERT)-based multi-head selection model is proposed for joint entity-relation extraction of industry chain information. Then, a relational completion model based on a relational graph convolutional network (R-GCN) and graph sample and aggregate network (GraphSAGE) is proposed, which considers both semantic information and graph structure information of KG. Experimental results show that the performance of the proposed joint entity-relation extraction model and relational completion model are significantly better than other baselines. Finally, an industry chain information model is established based on the data of 18 industry chains in the field of basic machinery, which proves the feasibility of the proposed method.