The utility model relates to the technical field of building heat preservation, and discloses a pre-
trepanning type outer wall heat preservation structure which comprises a heat preservation plate and a connecting piece arranged at the end of the heat preservation plate, the connecting piece comprises a body arranged on an outer wall and a fixing piece, and the body is provided with a containing cavity for containing an expansion
pipe and a clamping opening communicated with the containing cavity and provided with an opening deviating from the outer wall. The fixing piece is provided with a clamping part matched with the clamping opening in a clamping mode, and the fixing piece extends towards the side, away from the outer wall, of the heat preservation plate so as to apply
extrusion force towards the outer wall to the heat preservation plate, so that the situation that the bonding effect of the heat preservation plate and the outer wall is affected due to the fact that
powder generated by
trepanning enters the space between the heat preservation plate and the outer wall is avoided. Therefore, the bonding stability of the heat preservation plate and the outer wall is guaranteed, meanwhile, the situation that the bonding effect of the heat preservation plate and the outer wall is affected due to vibration of the heat preservation plate caused by
trepanning of the heat preservation plate is avoided, meanwhile, compared with heat preservation nails, the connecting area of the fixing pieces and the heat preservation plate is increased, and the stability of the heat preservation plate is further improved.