The invention discloses a hot-dip galvanizing furnace nose nitrogen humidifying device. According to the hot-dip galvanizing furnace nose nitrogen humidifying device, a furnace nose can be internally,uniformly and stably humidified according to the humidifying degree required by a process, moreover, the influence of condensation of humidifying gas on humidifying of the furnace nose can be prevented, two water tanks are arranged, two gas-water heat exchangers are arranged in one water tank, so that dry gas is preheated without being in contact with water, the other water tank is used for gas humidifying of a wet gas pipeline, then the dry gas and the wet gas are mixed and then enter the furnace nose to dehumidify the furnace nose, moreover, the two water tanks communicate with each other below the liquid level and above the liquid level at the same time, heaters are arranged in the two water tanks correspondingly, so that automatic control of the water temperature of the two water tanks are achieved.