Wire-tightening device used for replacing double-string insulator

The utility model discloses a wire-tightening device used for replacing a double-string insulator. The wire-tightening device comprises two sleeves (1), a handle assembly (2), a connecting lead screw I (3) and a connecting lead screw II (4). The handle assembly comprises a ratchet wheel mechanism and a handle. The connecting lead screw I and the connecting lead screw II are connected in the sleeves via threads. The wire-tightening device also comprises a connecting part I (5) and a connecting part II (6). The connecting part I is connected with the left end of the connecting lead screw I via the threads. The connecting part II is provided with a left hanging plate (61) and a right hanging plate (62). The right end surface of the connecting lead screw II is provided with a connecting plate (41). The right hanging plate and the double-plate of the double-string insulator are connected via bolts. The left hanging plate and the connecting plate are provided with long circular bolt holes and connected via the bolts. The double-plate is connected via the detachable replacing hanging plates or hanging hooks, and the relative position and angle of the wire-tightening device and the double-plate can be adjusted so that work safety is enhanced and work intensity of operation personnel is reduced.