Sandwich-structured low-smoke halogen-free power cable and preparation method thereof

The invention belongs to the technical field of power cables, and provides a low-smoke halogen-free power cable with a sandwich structure and a preparation method thereof, the low-smoke halogen-free power cable with the sandwich structure comprises a cable core, a first insulating heat conduction layer, a glass tape wrapping layer, a second insulating heat conduction layer and a sheath layer; the first insulating heat-conducting layer comprises low-density polyethylene, a composite insulating heat-conducting filler, an antioxidant, a plasticizer and a lubricant; the second insulating heat-conducting layer comprises modified polyester, an antioxidant, a plasticizer and a lubricant; the sheath layer comprises an ethylene-vinyl acetate copolymer, polyvinylidene fluoride, modified talcum powder, modified calcium sulfate whiskers, an antioxidant, a plasticizer and a lubricant. According to the low-smoke halogen-free power cable provided by the invention, through a sandwich structure formed by the first insulating