The invention discloses a temperature-resistant high-
voltage cable and a preparation process thereof, and relates to the technical field of high-
voltage cables. The temperature-resistant high-
voltage cable comprises a plurality of high-voltage cells and a plurality of heat-conducting
silicone grease insulating plates, wherein one sides of the plurality of heat-conducting
silicone grease insulating plates are fixedly connected with each other, connection points thereof are located at the center of the cross section of the cable, and the high-voltage cells are located in included angles between two adjacent heat-conducting
silicone grease insulating plates. According to the temperature-resistant high-voltage cable, the heat-conducting
silicone grease insulating plates are additionally arranged on the inner side of a heat-conducting
silicone grease insulating layer, so that the high-voltage cable has better heat dissipation capability, the temperature of the
metal cell cores is reduced to a certain extent, the resistance of the
metal cell cores is further reduced, and the
power loss is further reduced; and a cooling fireproof layer, an inner fire-resistant heat-insulating layer, a cooling heat-insulating armored fireproof layer and a
flame-retardant outer sheath are sequentially and additionally arranged on the outer side of the heat-conducting
silicone grease insulating layer, so that the high-voltage cable has better fireproof capability, and more rescue time is won for the high-voltage cable when a fire occurs.