The steel-lined plastic storage tank is made using a special hot melt rotational molding process. It involves welding a steel mesh (tortoise shell) to the inner surface of the steel body, using pure polyethylene (PE) as the raw material. The polyethylene lining is then melt-molded inside the steel tank, integrating the steel mesh with the polyethylene to form a cohesive structure. This ensures a firm transition and connection between the polyethylene lining and the steel body surface. The thickness of the polyethylene lining can be adjusted according to actual needs, ranging from 15 to 20 mm. The polyethylene lining features no weld seams, is non-toxic, resistant to aging and impact, and corrosion-proof. It addresses the drawbacks of plastic rotational molding tanks, such as poor rigidity and low temperature resistance. The product's inner surface is flat, smooth, and robust, offering superior corrosion resistance, non-leakage, non-delamination, wear resistance, high-temperature tolerance, and a longer lifespan compared to traditional glass-lined, stainless steel, and fiberglass tanks of the same specification. It is an ideal container for storing and transporting corrosive liquids.