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Technological process: This sewage treatment recycling system removes the contaminants from water effectively with a physical method to achieve the clarity of clear water. It also neutralizes the acidity or alkalinity in sewage and removes hazardous substances by precipitation and solid-waste separation. The clear solution in waste-water is delivered by centrifugal pump to a precision filter and a carton sand filter for filtration. At last, it passes the UF membrane and reverse osmosis (RO) membrane, which can completely leach bacteria and tiny molecules out with filtration micropore < 0.0001 μm, for filtration. Water through RO membrane filtration is recyclable RO pure water, which realizes zero emission and avoids secondary pollution during common environmental treatment.