The utility model discloses a composite flame-retardant cable in the field of cables, which comprises a cable core. The cable core includes at least one signal wire core and at least one pair of power wire cores, wherein each signal wire core is a conductor with an insulating layer extruded outside, and each power wire core is formed by stranding two conductors with insulating layers extruded outside. An outer conductor covering the outer surface of the cable core includes a composite aluminum strip layer and a tinned copper wire braided layer, wherein the composite aluminum strip layer is in a lapping structure, and the tinned copper wire braided layer covers the outer surface of the composite aluminum strip layer. An oxygen barrier covers the outer surface of the outer conductor, a sheath layer is arranged outside the oxygen barrier in a covering manner, and filling materials are arranged in peripheral gaps among the signal wire cores and the power wire cores in the outer conductor. The composite flame-retardant cable not only can normally transmit electric energy, but also can transmit control and communication signals, and has high-temperature resistant and flame-retardant functions.