Aim at the problem of easily passivation and poorly continuous usability of iron and carbon packings in iron carbon micro-electrolysis treatment of organic wastewater, the ultrasound (US)-zero valent iron/granular active carbon (Fe⁰/GAC) micro-electrolysis was used to degrade nitrobenzene wastewater. The continuous usability of Fe⁰ and GAC was studied. The effect of Fe⁰ dosage, GAC dosage and initial pH value of wastewater on nitrobenzene degradation by US-Fe⁰/GAC were investigated. The results show that, when Fe⁰/GAC is not changed, the removal efficiency of four batches of same nitrobenzene wastewater treated by US-Fe⁰/GAC is all about 90%, whereas under Fe⁰/GAC treatment, 4 times of nitrobenzene removal efficiencies are 48%, 36%, 25% and 17%, respectively. The ultrasound can not only maintain the high activety of iron and carbon packings to use them continuously, but also can effectively improve the removal efficiency of nitrobenzene treated by Fe⁰/GAC. The suitable operating parameters of degrading nitrobenzene obtained are Fe⁰ dosage 20 g·L^-1, GAC dosage 10 g·L^-1, initial pH=4 for wastewater. Under these conditions, after 80 min, the removal efficiency of nitrobenzene reaches 93% and the biochemical coefficient BOD₅/COD_cr of effluent reaches 0.32, which can meet the requirement of biochemical treatment.