Environmentally friendly anti-corrosion plastic-coated steel pipes for water supply generally employ four main processes: spraying, adsorption, roller lining, and dip coating. Different processes are typically applied in different fields. The most commonly used manufacturing processes for such pipes are spraying or dip coating. The production generally involves a series of steps including pre-treatment, external shot blasting, internal sandblasting, preheating, spraying or dip coating, curing, and inspection before storage. The purpose of the process is to allow plastics such as epoxy (EP) powder or polyethylene (PE) powder to adhere to the surface of the steel pipe, forming a composite structure of steel and plastic. It is evident from the process that this method combines all the advantages of both steel and plastic pipes while addressing their respective shortcomings, earning it the reputation of being green, environmentally friendly, and multifunctional.