The utility model discloses a mounting structure that is used for in transformer installation optic fibre to link up ware, including the transformer box wall, the mounting hole, fixing bolts, the mounting panel, the fourth through -hole, lug and first installation sleeve, telescopic inboard third installation sleeve and the connecting rod connected of first installation, be connected with the wedge on the connecting rod, still be connected with the third sheath on the first installation sleeve, a plurality of second through -hole has still been seted up on the telescopic cylinder of first installation, first installation sleeve and the telescopic internal connection of third installation have first limiting plate, the optical fiber jacket has been placed to the inboard of first limiting plate, the inboard of mounting panel is connected with spacing ring and second installation sleeve, the telescopic inside of second installation is fixed with the second limiting plate, first through -hole and breach have been seted up to the telescopic inboard of second installation, jiao kou has still been offered out at the telescopic outside top of second installation. The utility model discloses can improve the not enough of prior art, have better sealed protection effect.