The invention relates to a domestic energy-saving heat supply device. By means of the domestic energy-saving heat supply device, the characteristic that China is rich in biomass energy is fully utilized, a biomass semi-gasification furnace, an energy-saving water tank, a chimney, an air preheating pipe and an indoor heat exchanger are organically combined together, and accordingly efficient, fast and pollution-free heating is achieved in winter, and living conditions of people are improved. Meanwhile, the domestic energy-saving heat supply device has the advantages of being convenient to use, low in manufacturing cost, simple in structure and the like and can be widely applied to rural areas.