Fire coated plastic steel pipe, straight seam steel pipe or seamless steel pipe as the base pipe, the outer wall is coated with high adhesion, impact resistance, anti-corrosion and weather-resistant thermosetting powder coating, the inner wall is coated with high adhesion, anti-corrosion, food-grade sanitary thermoplastic powder coating. Using sandblasting chemical dual pre-treatment, preheating, inner coating, outer coating, curing, post-treatment and other processes, made of water inside and outside coated plastic composite steel pipe, is the traditional steel plastic pipe, galvanized pipe upgrade type of cost-effective products.