The embodiment of the invention provides a file management method, an expired file deletion method and devices. The method includes a step of obtaining meta information of a file stored in a cloud storage system, wherein the meta information at least includes a file creation time, a user ID and a file name, and the file creation time belongs to a time accurate to a predetermined time precision, astep of storing the meta information in a first data table, wherein the first data table is provided with a primary key which includes a first target column and a second target column, the first target column is used for storing the file creation time, the second target column is used for storing a file identifier determined based on the user ID and the file name, a step of sorting the current first data table with a data sorting sequence of sorting according to the first target column and then sorting according to the second target column. According to the technical solution provided by the embodiment of the invention, the burden on a user can be reduced, and the deletion efficiency of an expired file is improved.