The utility model discloses a compound low pressure power cable of fire -resistant flexible environmental protection optic fibre of level four, including optic fibre and cable core, the cable core comprises many insulation core transposition, insulation core include conductor and crowded package in the outer insulating layer of conductor, many insulation core's transposition clearance is provided with the filling layer, cable core and filling layer outside are provided with the flame retardant coating, outside the flame retardant coating by interior and outward in proper order the parcel have at a distance from oxygen layer, armor and outer jacket. The utility model discloses application scope is extensive, is a cable that can be used to fields such as oil, chemical industry, smelting, building, subway, tunnel and nuclear power station, can combine electric power, communication transmission in an organic whole. Just the utility model discloses the refractiveness is strong in easily fire, easily exploding the environment, has higher security and reliability.