The utility model discloses a low-smoke halogen-free 1E-type nuclear-power-station-used K3-grade computer cable which includes a plurality of core wires. Each core wire includes two conductors which undergo pair twist, two filling cores added in the pair twist of the two conductors and a single-face aluminum-plastic composite layer which wraps externally all corresponding conductors and filling cores. Each conductor includes a wire located at the middle part, and a polyester film layer and an insulating layer, which externally wrap the wire. Each insulating layer is made of a radiation-resistance low-smoke halogen-free silicone rubber used for nuclear power. The plurality of core wires form a cable core. The cable core is externally wrapped with a lapping layer. The lapping layer is externally wrapped with a silver-plated copper-wire woven layer. The silver-plated copper-wire woven layer is externally wrapped with a sheath layer. The sheath layer is made of the radiation-resistance low-smoke halogen-free silicone rubber used for the nuclear power. The low-smoke halogen-free 1E-type nuclear-power-station-used K3-grade computer cable is great in radiation resistance and shielding performance, great in stretch resistance and flexibility and capable of being used safely under a nuclear-power-station environment for a long term.