The utility model discloses a low -voltage power cable for nuclear power plant, including conductor, insulating layer, inner sheath and oversheath, the insulating layer is the double -deck crowded package structure altogether of irradiation EPT rubber the inner insulating layer and fire -retardant irradiation EPT rubber external insulation layer, conductor and insulating layer constitute insulation core, and a plurality of insulation core strand into the cable core, and cable core gap is equipped with the filling layer, the outer overlapping of cable core have around the covering the crowded package of inner sheath is outside the covering, woven zinc -plated steel wire armoring layer between inner sheath and the oversheath, armor crowded package does not outward have the steamed low fire -retardant resistant radiation radiation cross -linking thermoset polyolefin oversheath of cigarette. The utility model discloses have and does not have steamed, low cigarette, fire -retardant, heat -resisting, ageing resistance, anti radiation characteristic, excellent electric, machinery, environmental protection still have simultaneously, can wide application place power transmission system inside and outside nuclear power station 1E level shell.