The invention provides a method and device for degrading nitrobenzene waste water in a high gravity field through catalytic ozonation, belongs to the technical field of nitrobenzene waste water ozonation degradation, and solves the problem that sedimentation of ferrous ions is caused when the initial pH value of the waste water is 7 to 10 in the conventional catalytic ozonation treatment method of nitrobenzene waste water. The method comprises the following steps: a ferrous iron chelating agent is mixed with nitrobenzene waste water of which the initial PH value is 7-10, the mixed solution is introduced into a high gravity reactor to react with ozone gas, and ozone dissolved in catalytic water generates hydroxyl free radicals, so that nitrobenzene compounds are degraded through ozonation. When the method provided by the invention is compared with the conventional bubbling reaction, the mass transfer rate of ozone is improved by two times; and besides, the ferrous iron chelating agent is combined with an ozonation process, therefore, ozone in the waste water is quickly decomposed, a lot of hydroxyl free radicals are generated, organic pollutants are quickly decomposed, and the oxidation efficiency is doubled; the process is simple, the treatment cost is reduced to the largest extent, the removal rate of nitrobenzene compounds reaches 95% or above, the mineralization rate reaches 80%, and the utilization ratio of ozone is improved by 1 to 2 times.