The invention discloses a file cabinet with functions of automatic classification, storage and extraction. The file cabinet comprises a base, a file bracket part, a sliding bracket part, a file extraction and storage part, a file transport part and a moving part, and is characterized in that when the file cabinet is in use, firstly the moving part moves the whole file cabinet to a designated position, positions of all file folders are stored in a control computer, when extraction is needed, the sliding bracket part drives the file extraction and storage part to move to the position where the file folders are placed, takes out the file folders, places the file folders on the file transport part, and transports the file folders to a file extraction box, and the file folders are manually taken out, when the file folders need to be placed, the sliding bracket part drives the file extraction and storage part to the rear of a file storage box, takes out the file folders, and then places thefile folders to the designated positions, thereby more conveniently and rapidly helping people getting the required files, saving the time and energy wasted by manual searching and file placement, improving the working efficiency of people, and achieving the automatic classification, storage and extraction.