Mineral insulated cable and preparation method thereof

The invention discloses a mineral insulated cable and a preparation method thereof. Relates to the technical field of cable production, the cable is composed of a copper conductor core wire and an insulating sheath, the insulating sheath is prepared from the following components: modified coating magnesium oxide powder, fly ash, attapulgite powder, quartz sand powder, potassium tetrafluoroaluminate and mica powder; wherein the mixing weight part ratio of the attapulgite powder to the quartz sand is 5: 1; the mixing weight part ratio of the potassium tetrafluoroaluminate to the mica powder is 1: 1; according to the mineral insulated cable prepared by the invention, through the synergistic effect of all the components, the prepared mineral insulated cable is combusted at the flame temperature of 950 DEG C and a voltage of 750v is applied between the cable and the outer sheath for 100 minutes, the insulation is not damaged, and the insulation stability is greatly ensured while the mineral insulated cable has hig