The invention discloses a high-strength and corrosion-resisting plastic pipe and a preparation method thereof. The high-strength and corrosion-resisting plastic pipe is prepared from the following raw materials in parts by weight: 50 to 60 parts of polypropylene resin, 30 to 40 parts of polyvinyl chloride resin, 1 to 5 parts of polytetrafluoroethylene resin, 1 to 2 parts of triethyl citrate, 1 to 5 parts of calcium carbonate, 1 to 5 parts of silicon powder, 1 to 2 parts of butyl stearate, 1 to 2 parts of a thermal stabilizer and 1 to 3 parts of a solid lubricant. The high-strength and corrosion-resisting plastic pipe disclosed by the invention is simple in construction process and low in cost and has excellent mechanical property, flame-retarding property and antibacterial property; meanwhile, the high-strength and corrosion-resisting plastic pipe has ageing resistance, high temperature resistance, corrosion resistance and stable performance and has a wide application range.