The invention provides a fireproof mineral insulation heating cable loop structure which is characterized by comprising a mineral insulation heating cable, a mineral insulation conductive cable and a common cable which are sequentially connected in an abutting mode and are mutually communicated. A stainless steel bush sleeves the connection position of the mineral insulation heating cable and the mineral insulation conductive cable, the stainless steel bush is filled with silica sand, two ends of the stainless steel bush are filled with magnesium oxide, stainless steel protection skins wrap two ends of the stainless steel bush, and a conductor penetrates the middle of the silica sand and the magnesium oxide. A copper sleeve sleeves the connection position of the mineral insulation conductive cable and the common cable. A pressure welding terminal is arranged in the copper sleeve, and the copper sleeve is filled with sealant. The mineral insulation heating cable and the mineral insulation conductive cable are welded, the mineral insulation conductive cable is connected with the common cable in an abutting mode, the mineral insulation cable is prevented from being moistened, and the problem that the sealant cannot resist high temperature is effectively solved.