Abstract: The wastewater treatment process was obtained by acid precipitation，electrolysis，Fenton oxidation and flocculation according to the characteristics of nitrobenzene wastewater. The experimental conditions of pH，electrode，flocculation，oxidation agent were optimized and the suitable process conditions were obtained through the monitoring of COD and the concentration of toluene，aniline，phenol，nitrobenzene， o - nitrotoluene， m - nitrotoluene and p - nitrotoluene.

Key words: nitrobenzene wastewater, acid precipitation, electrolysis, Fenton oxidation, flocculation