A multi-fuel heating furnace comprises a furnace body provided with a hearth inside. An ash bucket is disposed below the hearth. The upper portion of the furnace body is provided with a chimney holder and a feed hole communicated with the hearth. The hearth is provided with an internal compartment communicated with the hearth. The compartment houses a thermoelectric blower which is provided with a switch and which is disposed on the inner wall of the compartment. Both the compartment and the furnace body are provided with a plurality of pores allowing the thermoelectric blower to suck in air. The multi-fuel heating furnace has the advantages that combustion can be subjected to blow pressurizing to achieve thorough combustion and higher heating amount; the switch for controlling the thermoelectric blower to start and stop is provided, the thermoelectric blower is stopped when not needed, fire sealing time is longer, and continuous combustion is achieved; operation of the thermoelectric blower allows the furnace to well combust in the area lower than 4500m in altitude, and the furnace is well adaptable to high altitudes and high in heat efficiency; the multi-fuel heating furnace is also applicable to flat areas and is low in production cost, low in application and maintenance costs and stable and reliable in performance.