The utility model discloses an insulating boot is pressed from both sides in waterproof dustproof bracing cable, including the dustcoat body and inner cover body, dustcoat body cladding in inner cover body's outside, the dustcoat body and the inner cover body intercommunication stagger body, be equipped with the cavity between the dustcoat body and the inner cover body, inner cover body's bottom cover body disconnection sets up to the fly leaf, the bottom cover body middle part vertical fixation of the dustcoat body sets up the bracing piece, the upper end of bracing piece is articulated with the middle part of fly leaf, set up on the plate body of fly leaf and cover the opening that mouthful position corresponds with the stagger body, the flowing water mouth is seted up respectively at the both ends of fly leaf, the bottom of flowing water mouth is equipped with the symmetry and is the guide plate that the slope was described, the through -hole is seted up in the both sides of the stagger body to the bottom cover position of the dustcoat body, the radius stage body structure into big -end -up is established to the through -hole. This insulating boot is pressed from both sides in waterproof dustproof bracing cable, it sets up to the fly leaf to personally experience sth. Part of the body inner cover body's bottom cover to break off, sets up big -end -up's structure through -hole to realize waterproof, dirt -proof function.