The utility model discloses a prevent weighing down sleeve suitable for unsettled bolt is installed fast, including the anti -skidding sleeve of pinning and cup jointing the bolt head, the bolt head is cup jointed to telescopic one end, and the other end is provided with two pinholes that the installation antiskid was pinned, the sleeve is the transversal shape of mating with the bolt head of personally submitting of hollow cylinder form, sleeve inner wall, telescopic height is greater than the height of bolt head, the utility model discloses simple structure need not change crude derrick structure, only need add sleeve and corresponding pin part, to prevent weighing down the sleeve weld on the capillary derrick, and effectively reduce or remit operating personnel and stand at the supplementary fastening bolt of lower extreme, and only need to link up mouthful at derrick platform centering, and preset the hexagonal screw in preventing weighing down the sleeve, and only need insert to add behind the bolt and prevent weighing down the pin, and alone can accomplish the derrick in derrick platform top and link up the installation, effectual prevention operating personnel is because of fall in the high altitude that misoperation etc. Led to the fact, object strike accident.