Energy-saving boiler

The invention relates to an energy-saving boiler. The energy-saving boiler comprises a combustion chamber, an air chamber, a heating chamber and a smoke discharging pipe, wherein a fuel inlet, an air inlet and a flaming opening are formed in the combustion chamber; the air inlet is communicated with the exterior through an air inlet pipeline; one end of the heating chamber is communicated with the flaming opening of the combustion chamber; the other end of the heating chamber is communicated with a smoke flue; the smoke flue is communicated with the smoke discharging pipe. The energy-saving boiler has the design key points that the air inlet pipeline is arranged in the smoke flue, a sinuous air inlet passage is formed in the air inlet pipeline, one end of the air inlet passage is communicated with a cold air inlet formed outside the smoke flue, and the other end of the air inlet passage is communicated with the air inlet of the combustion chamber through a hot air pipe. The invention aims to provide the energy-saving boiler which is complete in fuel combustion and high in heat supply efficiency of fuel.