The invention belongs to the technical field of data exchange of the Internet of Things, and discloses a multi-domain data sharing exchange platform architecture based on a block chain, which comprises a data sharing exchange center module used for connecting other subdomain modules in series so as to achieve interconnection and intercommunication among subdomains and the sharing exchange of dataamong the subdomain, and managing sub-domain services and sub-domain data, and integrating all Internet of Things resources into a unified Internet of Things data and service providing platform; subdomains, each domain being customized by a local service provider to meet the protocol specification implementation of the data sharing exchange center. The data generated by the subdomains are stored locally, when data sharing is needed, the data needs to be opened or obtained from other domains, and the idea of taking the data as the center is achieved; when data sharing exchange needs to be carried out between domains, authority judgment is carried out through the data sharing exchange center, interconnection and intercommunication are carried out, the subdomain coupling degree is low, and data sharing with other subdomains can be flexibly carried out.