Energy-saving blast furnace

The utility model provides an energy-saving blast furnace, and relates to the technical field of blast furnace ironmaking, the energy-saving blast furnace comprises a furnace body, the bottom of the furnace body is connected with an air inlet pipe, the side wall of the furnace body is communicated with a return pipe, the return pipe is respectively communicated with the upper and lower ends of the furnace body, the return pipe extends to be communicated with an extension pipe, and the other end of the extension pipe is communicated with an exhaust fan; the other end of the exhaust fan is communicated with the backflow pipe, a first cleaning assembly is arranged in the backflow pipe, a second cleaning assembly is arranged in the extension pipe, the backflow pipe, the extension pipe and the exhaust fan are arranged on the side wall of the furnace body in a communicating mode, combustion gas in the furnace body can be effectively recycled, the sufficiency of gas combustion is guaranteed, and the service life of