The utility model relates to a split type high tension cable connects explosion -proof box of putting out a fire of protection, it includes the shell body, and shell body middle part constitutes split type structure by two semi -cylindrical shell, and each semi -cylindrical shell forms by the stainless steel material system of once only rolling up, and the outside circumference of shell body is provided with a plurality of strengthening ribs, the tight structure of necking of gradual change formula is adopted at shell body both ends to a mouthful department forms a cylinder in the deflation, and the internally mounted who reduces the mouth has whole fashioned recess formula waterproof sealing spare, all be provided with main installation of cable mouth and ground connection installation of cable mouth in the cylinder of both ends respectively, the bore of main installation of cable mouth is greater than the bore of ground connection installation of cable mouth, all is provided with elasticity fight against violent repression thermal -insulated guard plate and temperature sensing automatic fire extinguishing device in two cylinders departments, the semi -cylindrical shell middle part interval that lies in upper portion is provided with two and lets out the ability hole, lets out for two and to be provided with extrusion formula sealed with silicone rubber pad and sealing flange by kong shangjun, the semi -cylindrical shell both sides that lie in the lower part are provided with one respectively and throw the material hole, throw material kong shangjun for two and are provided with the sealing flange.