Heating furnace convection device with multiple heating effects

The utility model discloses a heating furnace convection device with multiple heating effects. A convection tube assembly comprises an upper layer convection tube, a central tube and a lower layer convection tube, the upper-layer convection tube comprises an air inlet section and a spiral section, an input port of the air inlet section extends to the outside of the heating space, and an output port of the air inlet section is connected with an input port of the spiral section; the spiral section is wound on the outer wall of the central pipe, and an output port of the spiral section is connected with an input port of the central pipe; the lower-layer convection tube comprises an extension section and an air blowing section, and an input port of the extension section is connected with an output port of the central tube; an output port of the extension section is connected with an input port of the air blowing section, the air blowing section is provided with a plurality of jet flow holes, and the jet flow hole