The invention proposes a high-temperature-resistant multifunctional cable, and the cable comprises a supporting skeleton, six cable cores, an inner sheath layer, a wrapping layer, a thermal insulating layer, and an outer sheath layer. A thermal insulating supporting core is disposed at the center of the cable, and the interior of the thermal insulating supporting core is provided with a cavity extending in the axial direction of the cable. An external thermal conducting tube has a regular hexagon section, and the exterior of the thermal insulating supporting core is provided with six thermal insulating plates which are arranged in the radial direction of the thermal insulating supporting core. The ends, far from the thermal insulating supporting core, of the six thermal insulating plates are respectively connected with six corners of the external thermal conducting tube. The six thermal insulating plates enable the interior of the external thermal conducting tube to be divided into six thermal insulating cavities. The six cable cores are respectively disposed in the six thermal insulating cavities. Through the above design, a high-efficiency thermal conducting channel is formed between the external thermal conducting tube and the thermal insulating supporting core, thereby enabling the internal environment temperature of each thermal insulating cavity to be balanced, and enabling the heat generated during the operation of the cable cores to be distributed around the thermal insulating supporting core and to be quickly dissipated. The six thermal insulating plates enable the interior of the external thermal conducting tube to be divided into six independent thermal insulating cavities, and electromagnetic fields generated in the cable cores are distributed uniformly.