The invention relates to a data management method for protecting privacy of a user under a big data environment. The data management method comprises the following steps: enabling data, required to behidden, for the privacy of the user in the original database to be clear; replacing the privacy data required to be hidden with random data to form one privacy protection table, and also building a privacy correspondence table in which the random data corresponds to the privacy data; and replacing the original database with a privacy protection database composed of the privacy protection table and the privacy correspondence table, so as to be used in big data analysis. The data management method provided by the invention has the advantages that big data analysis operation is guaranteed, management right on self important data is provided and reserved for an original data provider, and a guarantee is provided for protecting the privacy of the user.