The article introduces the background and importance of “Blockchain in downloading data on Internet of Things nodes” and suggests that in the period of rapid development of artificial intelligence, a large number of communication devices Information technology has virtually no ability to protect data during the digital transformation process, and access to devices, data transmission lines, and data platforms is easily susceptible to impersonation, theft, and interference. It seriously affects the security and reliability of the Internet of Things environment in general. At the same time, due to the customization and diversification of Internet of Things terminals and applications, it has brought more security risks to Internet of Things business. Therefore, more attention is paid to the reliability of data. Faced with the above problems, the article suggests that reliable data transmission is an effective solution.