The invention discloses a domestic energy-saving boiler, which is an essential domestic heating appliance in people's lives, but the traditional oven has the defects that the heat output is insufficient, firewood is burnt for ignition, indoor and outdoor air is polluted, carbon monoxide poisoning is caused, the use is inconvenient and the like, bringing lots of troubles to the general residents. The domestic energy-saving boiler disclosed by the invention is more advanced than the prior art, and has the advantages that the automation level is high, energy is saved, environment is friendly, and the control system is excellent. The domestic energy-saving boiler has the main characteristics that the automatic ignition is realized; automatic water supply is realized; heating and cooking can be carried out simultaneously; automatic water discharge and freezing proofing are realized; an outdoor exhaust port is automatically closed after extinguishment; ignition is carried out at fixed time; a heating pipe is provided with thermal energy by the domestic energy-saving boiler, so that a user can use a radiator for warming and the like.