As the new-generation information technology, such as cloud computing and big data, integrates in depth with traditionalindustrial operation technologies, the industrial Internet becomes a new driving force for the digital transformation of industrialenterprises. Meanwhile, industrial Internet security problems have increased; therefore, improving the technological capabilities forguaranteeing industrial Internet security becomes the prerequisite for the high-quality development of the industrial Internet. In thisstudy, we first analyze the demand for industrial Internet development and summarize the development status of industrial Internetsecurity protection, evaluation, and monitoring technologies. Subsequently, we investigate the development trend, technologicaldifficulties, and challenges for the industrial Internet security technology, and propose the key technologies and their developmentapproaches. To promote the safe and healthy development of industrial Internet in China, the industrial Internet security technologiesneed to be customized in accordance with industrial characteristics and scenarios, and closely integrate with new technologies such asbig data and AI, to achieve active defense and create endogenous security capabilities.