Abstract: Sodium ferrate was prepared by electrolysis of ferreous as anode, brass wire as cathode, sodium hydroxide as solutions and ceramics diaphragm as diaphragm, the influences of anode cell volume, divided cell volume, electrolyte concentration, temperature and diaphragm aperture on the efficiency of producing sodium ferrate were studied. The results show that such facts including the decrease of anode cell volume, the increase of divided cell in appropriate scope, the increase of electrolyte concentration, the decrease of diaphragm aperture and proper temperature will all improve sodium ferrate concentration. And the best result is achieved by orthogonality experiment, when the volume of anode cell was 40mL, the volume of divided cell was 40 mL, the electrolyte concentration was 20 mol/L, the diaphragm aperture was 0.01 μm, the temperature was 35 ℃, the electricalcurrent was 2 A, sodium ferrate can produce 93.43 mmol/L after being electrolyzed for 3 hours.