Fuente: Wipo "BigData" The invention discloses a method and a system for maintaining sensitive data security of big data. According to the scheme, a data desensitization platform is constructed, wherein the data desensitization platform has multiple big data desensitization modes; a user can select the desensitization algorithms or combine different desensitization algorithms according to own requirements; therefore, the data desensitization platform can form a data desensitization method and rule suitable for the user's own demand; moreover, a personalized data desensitization method and rule can be formulated on the basis, so that the desensitized data cannot affect the application effect. And secondly, on the basis of data desensitization, in order to improve the security of the sensitive data, data encryption processing is performed in the data desensitization process or after data desensitization, so that the security of the sensitive data is further improved.