The invention discloses a multifunctional folding ladder, and the ladder is convenient to carry, use, store and manage. The technical scheme is: 1. The ladder legs comprise a plurality of foldable quadrilateral; 2. The ladder is provided with an inner and outer sleeve combination for herringbone ladder links, the outer sleeve is equipped with a clamping groove, the inner sleeve is equipped with atenon, and a notch is formed on the outer sleeve pipe for the tenon to pass through; 3. The upper part of the ladder is provided with a T-shaped supporting combination; 4. The lower part is provided with a transverse stud supporting combination (the two combinations are mutual security guaranteed). 5. The ladder is also provided with a jack pin and the like for increasing the height. The technicaleffects of the ladder include: the ladder is not only convenient to carry , use store and manage, but also very flexible and variable in use, can be used by a single leaf, can also be combined into aherringbone ladder by a combination of two leaves, two leaves overlapping can also increase different height, four leaves can also be used to form a higher herringbone ladder, two herringbone laddercross brace on the plate is a good platform for operation, the multifunctional folding ladder is disassembled for next use and is flex flexible in use and convenient to carry and store.