Fuente: Wipo "BigData" The invention provides a big data transaction matching method and system in the technical field of big data transaction. The method comprises the following steps: step S10, each client accesses a server through a firewall to carry out real-name authentication operation; step S20, after the seller client performs right authentication on the big data, setting transaction information of the big data and performing shelving operation; step S30, the buyer client sends a test order purchase request to the seller client based on the transaction information; step S40, the seller client selects a data sample based on the test order purchase request and sends the data sample to the server, and the server executes a data desensitization operation on the data sample; step S50, the buyer client performs an online fusion test on the data sample, and the server destroys the data sample after the fusion test is finished; and step S60, the buyer client sends a big data purchase request to the seller client based on the transaction information to complete big data transaction matching. The method has the advantage that the big data transaction efficiency is greatly improved.