With the advent of Internet and information era, enterprises are facing more and more opportunities and challenges. In the fierce market competition environment, how to use advanced science and technology to improve their core competitiveness is a question that every enterprise needs to think about. At present, most enterprises in China still use traditional marketing methods for product sales and customer maintenance, and this backward marketing model has been unable to meet the new requirements of modern social development. Therefore, in order to better cope with the increasingly complex and changing external business environment, enterprises must change their existing marketing concepts and means, and apply advanced computer network technology to marketing activities, so that they can obtain accurate and effective data information and make scientific and reasonable decisions in a timely manner. This paper first understands the research background of the subject and the research status of related fields at home and abroad, and then, aiming at specific problems, combining the characteristics of distributed storage, non-tampering, traceability and so on of blockchain technology, leads to a brand-new marketing information management model-adaptive defense system of marketing information management based on blockchain technology. This system can realize the functions of real-time sharing, safe and reliable transmission, and smart contract execution of marketing information; finally, the feasibility and practical value of this system are verified by specific cases.