The invention relates to a normal-pressure hot water heating furnace, which comprises a furnace frame, a smoke cylinder, a furnace container, a hearth, and a furnace bed. Wherein, the furnace frame sheathes the furnace container to form an interlayer water sheath; the hearth has a hearth fire-resistant liner. It is characterized in that: the furnace container comprises two water interlayer and two burning rooms with smoke through holes; the top of furnace has a interlayer water sheath; a circular smoke bank and a upright smoke bank are parallel with the smoke channel outside the furnace frame, which individually have a circular interlayer water sheath and a upright smoke bank interlayer water sheath; said two water sheathes are through to the interlayer water sheath of furnace frame; the upright smoke bank has a transverse water tube; and the ventilating groove is distributed on the inner side of hearth fire-resistant liner. The invention can apply the family with 70-200m2 or the working room with 200-5000m2, with higher burning rate and heat efficiency. |