The invention provides a novel waste heat boiler. The novel waste heat boiler comprises a housing, an upper tube plate, a lower tube plate and circulating casings, wherein the upper tube plate is positioned in the housing; the lower tube plate is positioned below the upper tube plate; a plurality of ventholes are uniformly formed in the lower tube plate; the end parts of the circulating casings penetrate the lower tube plate and communicate with the upper tube plate; a plurality of fins are uniformly arranged on the outer side of each circulating casing; the upper tube plate and the lower tube plate divide the housing into a water injection part, an exhaust part and a heat exchange part; the exhaust part is positioned between the water injection part and the heat exchange part; and the water injection part is positioned above the exhaust part. The novel waste heat boiler is reasonable in structure, the heat exchange efficiency is improved, and the equipment service life is prolonged.