Internet of things data exchange method and Internet of things data exchange system

The invention discloses an Internet of things data exchange method and an Internet of things data exchange system. The method comprises steps: a management side receives a directory retrieval request sent by a demand side, and a directory after being retrieved and filtered is sent to the demand side; if the directory after being retrieved contains needed data, the demand side sends a directory query request to the management side; the management side receives the directory query request, a data resource access mode involved in the directory query request is sent to the demand side; and the demand side sends a data exchange request to a provider according to the data resource access mode, and data resources returned by the provider are received, wherein the exchange data directory comprises data resource description information and the data resource access mode. Through providing an exchange data resource discovery mechanism based on the exchange data directory of the management side, problems of data discover