Multi-box box is made of stainless steel, closed structure form. Box top, front and back, left and right, using sandwich type double layer structure, the internal needs to be filled with thermal insulation material. The outer layer of the box is made of 304 stainless steel plate, the thickness of which is not less than 1.5mm, the inner layer of the box is made of 201 stainless steel plate, the thickness of which is not less than 1.2mm, the thickness of the material in the heavy part is not less than 2.0mm, and the middle filler is made of foam board or other high-quality material, the thickness of which is not less than 10mm.It can meet the requirements for the installation of optical cable access or active equipment of a number of carriers such as Telecom, Mobile, Unicom, Tietong and Huaji. Fibre optic cable access or active equipment installation use.