We present the first open-source and extensible knowledge extraction toolkit DeepKE, supporting low-resource few-shot and documentlevel scenarios in knowledge base population. DeepKE implements various information extraction tasks, including named entity recognition, relation extraction and attribute extraction. With a unified framework, DeepKE allows developers and researchers to customize datasets and models to extract information from unstructured texts according to their requirements. Specifically, DeepKE not only provides various functional modules and model implementation for different tasks and scenarios but also organizes all components by consistent frameworks to maintain sufficient modularity and extensibility. Besides, we present an online platform 1 for realtime extraction of various tasks. DeepKE has been equipped with Google Colab tutorials and comprehensive documents 2 for beginners. We release the source code at GitHub 3 , with a demo video 4 .

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