The invention relates to a novel heating furnace. The furnace comprises a furnace body, wherein a longitudinal hearth is arranged inside the heating furnace, the furnace body is provided with a combustor for heating the hearth and a chimney communicated with the furnace, and an exhaust port of the chimney is at least connected with a transmission channel which conveys flue gas to the hearth. The heating furnace provided by the invention is simple in structure, can convey the flue gas exhausted by the hearth to the hearth for recycling again through the transmission channel communicated with the chimney, and the heating furnace is used for recycling waste heat generated in a heating process and heating combustion air synchronously, thereby greatly improving the heating capacity of the heating furnace, recycling the heat energy, and improving the use ratio of heat energy.