The invention discloses a radiation-resistant flexible cable for a communication power distribution system. The radiation-resistant flexible cable comprises three conductive wire cores. A plurality offirst aluminum alloy round conductors are twisted on the outer surface of each round aramid fiber core. A polyvinyl chloride lining layer wraps the outer surface of each polyethylene insulation strip. A flame-retardant polyolefin elastic sheath layer is arranged on the outer surface of each polyvinyl chloride lining layer. Each round aramid fiber core is formed by twisting a plurality of aramid fiber yarns. A fire-resistant mica tape wraps the outer surfaces of the three conductive wire cores, and an insulating sheath layer wraps the outer surface of the fire-resistant mica tape. The insulating sheath layer is composed of a thermoplastic polyurethane elastomer, low-density polyethylene, ethylene acrylic ester, an ethylene-butylene copolymer, silicon dioxide, a butyronitrile compound, chlorinated polyethylene, zinc stannate, magnesium hydroxide and a poly molybdenum smoke inhibitor. The eddy current is greatly reduced. The circuit loss is reduced. The conductivity, the bending propertyand the corrosion resistance of the cable are improved. The material has a favorable char forming effect during combustion.