The invention relates to a screw closure tool, comprising a body and a rod part, wherein a sleeve is arranged at the front end of the rod part; a concave looping is arranged on the external surface of the sleeve; a penetrating hole is arranged on the concave looping in a parallel manner; the penetrating hole is communicated with a holding groove; the penetrating hole can be arranged for a location steel ball; an arrangement body is provided with a closure assembly which is provided with the rod part; the rod part is provided with a small-diameter concave looping and a middle-diameter concave looping to match with the body location steel ball to operate, prevent the closure assembly taking off from the holding groove, and enable the closure assembly to have proper front and back movable space; a holding groove of the screw head is arranged at front end of the closure assembly; a plurality of penetrating holes are arranged on the looping wall of the holding groove, which are all arranged for the location steel ball; the concave looping is arranged on the looping wall of the holding groove; and an O-shaped ring is used for locating the steel ball. The invention has the following advantages that the closure tool does not need to arrange magnetic components, can enable the screw to be completely fixed and not take off when the screw head and the holding groove of the closure assembly are combined, is beneficial for closure operation, and can prevent the iron scrap from piling up in the holding groove of the body.