The steel-lined plastic multi-jet water spray vacuum unit welds steel mesh onto the surface of the steel body, using pure polyethylene (PE) as the raw material. It combines steel plates, steel mesh, and PE into a single unit through rotational molding. The PE adheres firmly to the surface of the steel body. The steel-lined plastic multi-jet water spray vacuum unit boasts advantages such as seamless joints, no leakage, resistance to aging and impact, long lifespan, and compliance with hygiene standards. It addresses the shortcomings of full plastic rotational molding tanks, such as poor rigidity, low pressure resistance, and poor temperature resistance. The inner lining of the product is flat, smooth, and strong. Compared to traditional steel-lined plastic plate water tanks, steel-lined rubber storage tanks, and steel-lined glass fiber reinforced plastic storage tanks, it offers advantages such as no leakage, no peeling, resistance to certain pressure, high-temperature resistance, and a long lifespan. The steel-lined plastic multi-jet water spray vacuum unit can be customized according to customer requirements and can be used in parallel with two or more vacuum pumps.