Fast setting or loosening screwdriver

The utility model provides a quick assembling and disassembling screwdriver which comprises a connecting pole, wherein, a first sleeve joint part of the thin end of the connecting pole is connected with a handle, and a second sleeve joint part of the thick end is connected with a movable extension rod; an annular flute is arranged on the thin end of the pole; at least one steel ball ring is arranged on the thin end of the pole; a sleeve is sheathed on the pole; the steel ball ring is just positioned between the end face of the thick end of the connecting pole and the sleeve; one end of the sleeve, which is provided with a circular hole, and the steel ball ring and the end face of the thick end form interfering spacing; a sleeve ring is sheathed on the thin end of the pole; a movable steel ball in the sleeve ring is clamped and fixed in the annular flute; the other end of the movable extension rod connected with the second sleeve joint part is provided with a tool socket.