The invention provides a file search device of an embedded system, which comprises an acquisition module, a traversing module, a file name acquisition module, a matching module, a path acquisition module and a storage module, wherein the acquisition module is used for acquiring search criteria and search paths for file search; the traversing module is used for traversing files in the search paths in the storage module; the file name acquisition module is used for acquiring file names of the files traversed by the traversing module in the storage module; the matching module is used for matching the file names of the files with the search criteria acquired by the acquisition module; the path acquisition module is used for acquiring a storage path of the files in the storage module when the file names of the traversed files are matched with the search criteria; and the storage module is used for storing the file names of the files when the file names of the determined files are matched with the search criteria, and storing the storage paths of the files in the storage module. The file search device of the embedded system realizes automatic search of the files under the embedded system, and improves the efficiency of searching the files under the embedded system.