The utility model discloses an extensible multifunctional folder. Bottom plate, eight extension bodies are arranged on the outer wall of the top of the bottom plate; the stretching body comprises a cylindrical barrel. A circular hole is formed in the middle of the outer wall of the top end of the cylindrical barrel; an extension rod is inserted into the circular hole; a baffle plate is welded at the bottom end of the extension rod; first inserting holes are formed in the positions, close to the bottom end, of the outer walls of the two sides of the cylindrical barrel, the same inserting plateis inserted into the two first inserting holes, the bottom face of the baffle is attached to the top of the inserting plate, the diameter of the baffle is larger than that of the round hole, and second inserting holes are formed in the positions, close to the top end, of the outer walls of the two sides of the cylindrical barrel. According to the folder, office staff can store files and other files until the files are stored, the folder further has the extensible function, when the files of the same type are large in number and the inherent space of the folder is insufficient, the files can beunfolded, and therefore the storage space is increased.