A retractable screwdriver includes a base, a first tube fitted on the base, a first transmission rod, a second tube, a second transmission rod, a rod member and a rotating member. The first transmission rod has a blind hole, a first engaging portion at one end and a gear shaft at the other end, and is axially meshing with a ratchet gear and inner teeth of a cap of the rotating member as well. The second transmission rod includes a through hole, a second engaging portion at one end to engage with the first engaging portion, and a threaded portion at an opposing end for a tightening nut to be secured thereon. The tightening nut enables to adjust the length of the rod member. The gear shaft meshes with the ratchet positioning assembly, preventing the screwdriver from reversing to an opposing direction.
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