AbstractBuilding a national unified ISEMS (industrial internet security emergency management system) plays an important role in industrial cybersecurity defense. However, due to technical and management constraints, the current ISEMS has problems such as scattered security organizations, poor sharing channels, and fails to form an overall security guarantee capability for threat reporting, analyzing, warning, and disposing. The blockchain technology has the characters of decentralized trust construction, inter-organizational data sharing, data integrity assurance, data traceability, which just meets the requirements of the emergency management process. This paper analyzes the situation and challenges of ISEMS, describes the system architecture and organizational structure based on the blockchain, and describes the key implementation processes of blockchain-based ISEMS, including threat report, risk analysis, warning release and emergency response.