The invention relates to a solar heat supply device for villages and small towns. The device comprises a solar heat supply device and a water heating furnace used as an auxiliary heat source, wherein the water heating furnace body comprises a burner cap, an adjustable burner cap, a by-pass flue, a heat absorbing filter, an ash bucket and a water tank thereof; the furnace body is arranged in the center of the upper part of the water tank of the device; a part of 2/3 height of the water tank is provided with the ash bucket below the furnace body; and the solar heat supply device is in the structure that a photoelectric pump is arranged on a solar water return pipeline, the water tank can be internally provided with a heat exchange coil, and water heated by a solar heat collector directly enters the water tank or heats cold water in the lower part of the water tank through the heat exchange coil. By adopting the solar heat supple device, the consumption of conventional fuels can be reduced, and the indoor human environment of the villages can be improved, the purposes of energy saving and emission reduction are achieved and the indoor air quality is improved, the sustainable development of energy resources can be realized, and the human environment quality of the villages and the small towns is remarkably improved.