The utility model discloses a device for bolt time delay, including the cover body, shroud, cover internal portion for protecting the inner chamber. The cover body sets up three fixed button at least at open-type port lateral wall, fixed slot or the fixed orifices that the button is many is equally seted up and fix to shroud inside wall and corresponding fixed button position. The protection inner chamber of the said cover body is divided into the inner chamber in two different footpaths, and the inner chamber is protected for the bolt to a path cavity, and a big footpath cavity is the flange protection cavity the cover body is the PPR material, the shroud is rubber materials. This protection casing the whole covers of flange and bolt wherein, the one of which alleviates the natural rust and causes the screw thread damage for avoiding the bolt directly to expose in the air, next is for preventing that the bolt from corroding, and it is anticorrosive to carry out the mopping on the bolt surface usually, and after the surperficial film, the bolt hardly carries out the secondary after the dismantlement uses, causes the waste of man-made resources, the safe performance of the third protection flange.