The invention relates to an atmospheric steam domestic boiler which comprises a boiler furnace, a boiler shell, a combustor, a steam chamber and a chimney, wherein boiler water is filled between the boiler furnace and the boiler shell. The atmospheric steam domestic boiler is characterized in that at least one water tank communicated with the boiler water is arranged outside the boiler, and the at least one water tank is communicated with the air. Due to the fact that the water tanks are arranged additionally on the rear portion of the boiler to prevent the boiler from being closed and bearing pressure, and favorable guarantee is provided for absolutely safe running of the steam boiler. Besides, a reciprocating steam superheater pipe is additionally arranged in a top smoke discharging box of the boiler, and therefore smoke discharging temperature can be effectively reduced, steam temperature is increased, steam is dried, and an ideal steam utilization effect is achieved. According to the atmospheric steam domestic boiler, on the premise that the atmospheric steam domestic boiler is not closed or pressurized, the steam temperature can reach to an ideal operating temperature, the produced steam can be used for a plurality of household equipment, and therefore the multiple function purpose is achieved, energy is saved, and absolute security is realized.