Data processing method and data processing device of Flash file system

The invention provides a data processing method a Flash file system. The Flash file system comprises an address mapping block, and the mapping relationship of all logic blocks and physical blocks in the Flash file are recorded in the address mapping block. The method comprises the following steps: a first idle block is searched in the physical blocks of the Flash file system according to the renewal request of the Flash file, and a renewal Flash file is written in the first idle block; and a second idle block is continued to be searched in the physical blocks of the Flash file system, and a renewal address mapping block is written in the second idle block. The invention can realize the function of even wear of the Flash with lower expenses of the system on the basis of power-off protection.