This disclosure discloses a multifunctional screwdriver, comprising a handle, wherein an end of the handle is detachably inserted with a matching shaft; a ratchet head, in which a matching hole is provided, and the matching shaft is detachably inserted in the matching hole; the ratchet head includes a ratchet shell, a ratchet cap, ratchet teeth, and a plurality of reinforcing rings provided in the ratchet shell, the ratchet teeth pass through the plurality of the reinforcing rings and are fixed on a cylinder in the ratchet shell, the ratchet cap seals the ratchet teeth and the plurality of the reinforcing rings within said ratchet shell, internal of said ratchet shell is also provided with a ratchet mechanism. This disclosure solves the problem that screws/nails may rotate reversely during the operation process and effectively improves the work efficiency of the screwdriver.