The invention discloses a high-temperature-resistant fireproof wave-preventing sleeve and a preparation method therefor. The high-temperature-resistant fireproof wave-preventing sleeve is used for being arranged on the exterior of a wire in a sleeving manner; the high-temperature-resistant fireproof wave-preventing sleeve comprises a phlogopite pipe and a nickel-plated aramid fiber sleeve which are arranged on the exterior of the wire in sequence from inside to outside, wherein the phlogopite pipe comprises a phlogopite layer and an organic silica gel layer from the bottom up in sequence; and the nickel-plated aramid fiber sleeve is woven by nickel-plated aramid fibers, and the nickel-plated aramid fibers are obtained by plating the surfaces of the acid-washed aramid fibers with nickel. The wave-preventing sleeve prepared by the method has excellent high-temperature resistance; and meanwhile, the wave-preventing sleeve has a simple preparation method and easily-available raw materials.