The invention discloses a waste heat steam generation device. The waste heat steam generation device includes a waste heat steam generator and a normal pressure energy saving device; the waste heat steam generator includes a waste heat steam shell, a hot air inlet is formed in the side portion of one end of the waste heat steam shell, a hot air outlet communicated with an hot air inlet of the normal pressure energy saving device is formed in the other end of the waste heat steam shell, baffles which are distributed at intervals are arranged at the two sides of the waste heat steam shell, and asnake-shaped hot air channel is formed; the waste heat steam shell is provided with a plurality of vertical second steam water pipes at the two sides and center of the hot air channel; a second air collection box is arranged on the upper portion of the waste heat steam shell, the second steam water pipes are communicated with the second air collection box through a pipeline, a steam outlet pipe is arranged at the top of the second air collection box, and a steam valve is arranged on the steam outlet pipe. By making the waste heat steam generator and the normal pressure energy saving device form the combined waste heat steam generation device, secondary utilization of hot air waste heat is achieved through the waste heat steam generator and the normal pressure energy saving device, and theutilization rate of energy is greatly increased.