Tool for taking out loose threads of screw

The invention provides a screw loose thread taking-out tool. The screw loose thread taking-out tool comprises a packaging structure, a grooving mechanism and a driving mechanism. The packaging structure comprises a first shell and a second shell. An accommodating cavity is defined by the two side walls; the grooving mechanism comprises a pair of grooving arms, a pair of connecting rods and a transmission rod; the paddle-tumbler arms are arranged oppositely; the fixed end of the paddle-tumbler arm is rotationally connected to the inner wall of the first shell; one end of the connecting rod is connected to a position close to the middle of the paddle-tumbler arm, and the other end of the connecting rod is connected to one end, close to the paddle-tumbler arm, of the transmission rod; the driving mechanism comprises a conversion piece and a driving motor; an output shaft of the driving motor is connected with the transmission rod through a conversion piece; under the state that grooving is conducted on the surfa