The utility model relates to a power equipment construction and installation instrument discloses a double hook turn -buckle, this double hook turn -buckle include sleeve, spiro union at two hook -type lead screws at sleeve both ends, fix at the ratchet at sleeve middle part and be used for the ratchet handle of rotatory ratchet, wherein, the sleeve both ends area big footpath of internal screw thread is lighter than the sleeve and does not take the internal screw thread diameter, every hook -type lead screw spiro union rotation is passed telescopic one end terminal surface facial make -up and is equipped with the retaining ring, the material of retaining ring is steel, and the diameter of retaining ring is lighter than the sleeve and does not take the internal screw thread diameter, nevertheless is greater than sleeve area internal screw thread path, the retaining ring helps when the double hook stretches out, prevents double hook lead screw landing sleeve, not only can avoid the harm that causes the staff like this, does not need moreover that the staff is repeated to work, can improve work efficiency.