The utility model discloses a boiler gas recirculation fan anticorrosion system belongs to boiler gas recirculation field, include the air heater, desulfurization dust remover and the fan that connectgradually through the pipeline. The desulfurization dust remover with still be provided with the heat exchanger between the fan, the heat exchanger can make the follow the desulfurization dust remover is discharged and is got into the temperature of the flue gas of heat exchanger reduces to below the acid dew point. The flue gas is sent into boiler furnace with preheated air after the cooling sulphur removal mixes, this kind of gas mixture reduces furnace's radiation heat transfer volume, reaches the purpose of adjusting steam temperature. Sulphur oxygen compound in the flue gas is removed laggard income fan, makes the fan do not not corroded to protect the fan, also practiced thrift the running cost that the desulfurization was removed dust.