NOVELTY - Deep treatment method for sewage water comprises a combination of hydroxyl free-radical active oxygen and bio-active carbon. The hydroxyl free-radical active oxygen treatment comprises mixing sewage water with hydroxyl free-radical active oxygen, then sending into a water distributor at the bottom of oxidizing tower. The bio-active carbon treatment comprises flowing the treated sewage water into bio-active carbon reactor and then flowing through the bio-active-carbon layer filled in the reactor while the organics in water is further degraded and removed.    USE - Deep treatment method for sewage water (claimed), particularly first-grade discharged wastewater of urban domestic water and industrial wastewater.    ADVANTAGE - The method can remove organic pollutants in a highly effective manner, with excellent treating effect and low cost.    DETAILED DESCRIPTION - Deep treatment method for sewage water comprises a combination of hydroxyl free-radical active oxygen and bio-active carbon. The hydroxyl free-radical active oxygen treatment comprises mixing to-be-treated sewage water with hydroxyl free-radical active oxygen generated by a hydroxyl free-radical active oxygen generator till it is uniform, then sending into a water distributor at the bottom of the oxidizing tower, where the sewage water containing hydroxyl free-radical active oxygen flows upwardly through the oxidizing tower which is filled with catalytic filling material, and is retained in the tower for 5-20 minutes while the organic pollutants in the water is fast oxidized, degraded, decomposed or transformed to be removed. The primarily-treated water flows out from the oxidizing tower top. The addition amount of hydroxyl free-radical active oxygen is 5-25 mg per liter of to-be-treated sewage water. The bio-active carbon treatment comprises flowing the sewage water treated in the first step into bio-active carbon reactor from its one side and then flowing through the bio-active-carbon layer filled in the reactor for 30-180 minutes while the organics in water is further degraded and removed; flowing the treated sewage water out of the reactor from the other side and reaching the first-grade water-discharge standard.