The invention discloses a technology of synchronous desulfurization and denitration through a flue gas ammonia method based on electrolytic regeneration iron removal. The problem that for an existing desulfurization and denitration technology, the regeneration efficiency of an absorption solution is not high is solved. According to the technical scheme, the technology comprises the steps that pressurizing is conducted on flue gas, the flue gas is sent to a concentration tower to be reacted with a concentrated solution in the tower in a contacting mode, the flue gas coming out of the concentration tower is sent to an absorption tower to be reacted with the circulation absorption solution in the tower in a contacting mode, the concentrated solution reacted at the tower bottom part of the concentration tower is sent into an ammonium sulfate crystal system after iron is removed through a first electrolytic reactor, the absorption solution reacted at the tower bottom part of the absorption tower is sent back to the upper portion of the absorption tower to serve as the circulation absorption solution through regeneration, and the concentration solution enters an anode chamber in a reaction unit of the first electrolytic reactor to conduct an oxidation reaction and then enters a cathode chamber to conduct a reduction reaction; a reacted electrolyte is discharged from an outlet connection short pipe and sent into the ammonium sulfate crystal system. The technology of synchronous desulfurization and denitration through the flue gas ammonia method based on electrolytic regeneration iron removal has the advantages of being simple in method, low in investment cost and operating cost, high in conversion efficiency, good in iron removing effect and good in desulfurization and denitration effect.