Fuente: Wipo "BigData" According to the interaction information desensitization method focusing on big data privacy security and the server provided by the invention, in each privacy semantic interaction operation process, the feature interaction variables can be flexibly determined in real time according to the loaded multiple activity text frequent description items; and a plurality of activity text frequent description items are subjected to interaction operation by using the flexibly and real-time determined feature interaction variables, so that the privacy semantic interaction quality of the target big data desensitization decision-making network is improved, and various digital service user activity texts to be subjected to interaction information desensitization processing can be dealt with; the information desensitization decision analysis precision and pertinence of the big data desensitization decision network are remarkably improved, and it is ensured that the information desensitization decision label can accurately and effectively guide privacy protection processing of digital service user activity texts. Therefore, the technical problem that the privacy protection processing of the digital service user activity text is difficult to accurately realize in the traditional technology can be improved.