The invention provides a rural domestic solar energy and marsh gas combined capillary heating system, and belongs to the technical field of heating. The system is characterized in that a water outletof a solar heat collector is in communication connection with a hot water inlet in the upper end of a heat storing water tank through a water returning pipe of the solar heat collector, wherein a water draining port in the lower end of the heat storing water tank is in communication connection with a water inlet of the solar heat collector; a second circulating water pump is connected in series with a water supplying pipe of the solar heat collector; a hot water supplementing port in the upper end of the heat storing water tank is in communication connection with a water outlet of a marsh gaswall-mounted furnace through a pipeline, and a solenoid valve is connected in series with the pipeline; a water inlet of the marsh gas wall-mounted furnace is in communication connection with a tap water pipe; and a gas supplying port of the marsh gas wall-mounted furnace is connected to a marsh gas pool through a pipeline which is connected in series with a marsh gas bag. The system is energy saving, environmentally friendly, free from operation cost, high in heat exchanging efficiency, flexible to arrange, simple to construct, and high in practicality.