The invention provides a hierarchical data storage processing method, a hierarchical data storage processing device, and storage equipment. The hierarchical data storage processing method comprises the following steps of: when migrating a data block to a free block of a target level disk from a source-level disk, updating a mapping list in a buffer memory and acquiring the number of data blocks in a migrating state; when the number of the data blocks in the migrating state does not reach a preset threshold, maintaining the data blocks, in the migrating state, in the source-level disk; and when the number of the data blocks in the migrating state reach the preset threshold, updating a storage mapping table in a disk according to the mapping list in the buffer memory and releasing the storage space occupied by the data blocks, in the migrating state, in the source-level disk. The embodiment of the invention also provides a corresponding device and the storage equipment comprising the device. The technical scheme provided by the embodiment of the invention can ensure that the information of the storage mapping table in the disk can also correspond to an actual storage state even if abnormal power down happens.