The invention relates to an air humidification overheating device which is characterized by mainly comprising a heating furnace, a coal economizer, an atomizing mechanism and a control cabinet, wherein the heating furnace is composed of a flue, a furnace body, heat exchange pipes and a mixer, and the heat exchange pipe and the mixer are arranged in the furnace body. A mixed gas overheating segment, an air-water mixing segment and an air preheating segment are arranged in the inner part of the furnace body from left to right in order. The heat exchange pipes are arranged in the mixed gas overheating segment and the air preheating segment, the mixer is arranged in the air-water mixing segment, and the heat exchange pipes communicate with the mixer. Water in the coal economizer is connected to the mixer through the atomizing mechanism, and magnetic valves on pipelines in the heating furnace and the atomizing mechanism are controlled by the control cabinet. The air humidification overheating device has the advantages of energy conservation and emission reduction, high thermal efficiency, convenience in operation and easiness in realization, reduces the enterprise cost, and meets user needs, being the air humidification overheating device with high innovation.