The invention discloses a formula of a plastic pipe. The plastic pipe is prepared from the following components in parts by weight: 30-40 parts of polyvinyl chloride (PVC) resin, 3-5 parts of stearoylbenzoylmethane, 6-13 parts of polymeric ester calcium, 3-7 parts of epoxidized soybean oil, 4-8 parts of tribasic lead sulfate, 6-13 parts of an anti-impact agent, 3-7 parts of zinc oxide and 3-5 parts of paraffin. The formula of the plastic pipe has the advantages that hexamethylphosphoramide is added into the plastic pipe, so that not only is the oxidation resistance of the plastic pipe greatlyimproved, but the plastic pipe is low-cost and suitable for being popularized and applied; compared with the prior art, the plastic pipe prepared according to the formula provided by the invention hasthe characteristic of having high strength and high toughness at the same time, and has the advantages of high impact resistance and low price of product components, thus having strong market competitiveness.