Using a self-made multi-electrode ferrate electrochemical device, the single-variable method was used to study the effects of multiple electrolysis conditions on the formation of ferrate, and the parameters of the electrolysis conditions were optimized. The results show that the fluidity of the electrolyte is beneficial to the replenishment of anode OH^? and the overflow of hydrogen, which is conducive to the formation of ferrate; The arrangement of 3 anodes and 2 cathodes was adopted for the electrode plate, which can improve the electron transfer efficiency and reduce the distribution of reduced hydrogen, and promote the formation of ferrate. The spacing of electrode plates can affect the circuit efficiency and the degree of hydrogen evolution, which in turn affects the production of ferrate. Appropriate increase of current density can promote the formation of ferrate, while ecessively high current density will enhance the side reaction of oxygen evolution and inhibit the formation of ferrate. The increase of electrolyte temperature can increase the rate of ferrate formation, but also reduce its stability. The increase of electrolyte concentration promotes the formation of ferrate and the anode passivation will gradually become serious. When multi-electrode was used for electrolysis, the optimal plate spacing was 2 cm, the current density was 55 mA/cm², the temperature was 55 ℃, and the electrolyte concentration was 16 mol/L. Under the optimal conditions, the ferrate concentration was 19 mmol/L and the current efficiency was 66%. This study can provide a theoretical basis for the further preparation and application of ferrate by multi-electrode electrolysis.