The invention provides a filler for a high-temperature-resistant fireproof power cable. The filler comprises the following raw materials by weight: 12 to 18 parts of diethylene glycol diacrylate, 3 to6 parts of propyl isocyanate, 1 to 3 parts of barium sulfate, 2 to 5 parts of zirconium hydroxide, 3 to 8 parts of sodium metasilicate anhydrous, 1 to 4 parts of didecyldimethylammonium chloride, 3 to 6 parts of polyvinylpyrrolidone, 12 to 18 parts of carbon black, 8 to 16 parts of calcium carbonate, 1 to 5 parts of alumina and 2 to 5 parts of ethyl cellulose. According to the invention, the flame retardation performance of a filling layer is improved through improvement of the filler.