Flame-retardant polyethylene pipe and preparation method thereof

The invention discloses a flame-retardant polyethylene pipe and a preparation method thereof, and the flame-retardant polyethylene pipe is prepared from the following raw materials in parts by weight: 80-90 parts of polyethylene, 4-6 parts of a nano metal fiber/magnesium hydroxide composite inorganic flame retardant and 6-13 parts of a non-halogen flame retardant, the nano-metal fiber/magnesium hydroxide composite inorganic flame retardant is obtained by ball-milling and mixing modified nano-metal fibers and a nano-magnesium hydroxide inorganic matter. The modified nano metal fiber/magnesium hydroxide composite inorganic flame retardant serves as an inorganic filling material and is matched with the non-halogen flame retardant, the flame retardant effect is guaranteed while the using amount of the non-halogen flame retardant is reduced, and when the material encounters high temperature or a fire disaster, the flame retardant is combined with the polyethylene material, so that the flame retardant effect is imp