Fecha de publicación: 09/02/2024 Fuente: Wipo "BigData" The invention provides a big data delivery method and system in the technical field of big data transaction. The method comprises the following steps: step S10, performing real-name authentication on each client; step S20, after the seller client performs right authentication on the big data, setting transaction information and putting the transaction information on a server; step S30, the buyer client sends a test order purchase request to the server based on the selected transaction information; s40, the server receives a data sample fed back by the seller client; step S50, the buyer customer performs a fusion test on the data sample; step S60, the buyer client sends a big data purchase request to the seller client through the server based on the transaction information; step S70, the seller client selects corresponding big data based on the big data purchase request, and the big data is notarized through a block chain; and S80, the server delivers the big data to the buyer client through a federated machine learning technology. The method has the advantages that the reliability, the safety and the flexibility of big data delivery are greatly improved.