The invention discloses a flame-retardant high-weatherability high-strength electric threading pipe. The threading pipe comprises the following raw materials by weight: 55-65 parts of chlorinated polyvinyl chloride resin, 24-28 parts of styrenic thermoplastic elastomer, 1-3 parts of a lubricant, 10-14 parts of a compound flame retardant, 4-6 parts of a coupling agent, 3-5 parts of a compound barium-zinc stabilizer, 8-10 parts of an anti-cracking fibers, 2-4 parts of a compound insecticidal and antibacterial agent, 6 -8 parts of a filler, 7-11 parts of a processing aids and 12-16 parts of methyl methacrylate. The threading pipe provided by the invention has the advantages of excellent indexes of tear strength, tensile strength and elongation at breakage, good resistance to aging, hot and cold impact, microbes and the like, good fire resistance and flame-retardant effect, no smoke, no odor and long service life. Meanwhile, according to a preparation method for the threading pipe, the raw material used in the method are safe, reliable, harmless to environment and low in cost; the method is easy to operate and suitable for industrial production; so the preparation method has high practical value and good application prospects.