Multi-layer composite isolation type flexible mineral fireproof cable and preparation method thereof

The invention discloses a multi-layer composite isolation type flexible mineral fireproof cable and a preparation method thereof, and the fireproof cable comprises a copper core conductor, the surface of the copper core conductor is coated with a mica insulation layer, the surface of the mica insulation layer is coated with a copper protection layer, and the surface of the copper protection layer is coated with a protection sleeve. The protective jacket comprises the following raw materials in parts by weight: 100-120 parts of natural rubber, 5-8 parts of reinforced flame-retardant particles, 5-8 parts of anti-aging particles, 1-3 parts of a plasticizer and 1-3 parts of a lubricant, the reinforced flame-retardant particles contain a large amount of oxygen-containing acid of phosphorus and nitrogen atoms, the oxygen-containing acid of the phosphorus catalyzes a hydroxyl-containing compound to be dehydrated into carbon during combustion, then a coke layer is generated on the surface of the material, and the cok