An efficient and energy-saving civil boiler using solar energy comprises a boiler body, a solar energy photovoltaic panel and a main controller, wherein the top end of the boiler body supports the solar energy photovoltaic panel through a supporting frame; a smoke vent is arranged at the lower left end of the boiler body; the main controller is arranged at the upper right end of the outer side of the boiler body; a heat preservation water tank is arranged at the upper end inside the boiler body; the middle of the bottom end of the heat preservation water tank is connected with the middle of the bottom end of the boiler body through a partition board; a combustion chamber is located on the left side of the partition board; a heating water tank is arranged at the upper end of the combustion chamber; a storage battery is arranged on the right side of the partition board; the upper end of the storage battery is connected with an electric heating water tank; the top end of the heating water tank is connected with the left side of the bottom end of the heat preservation water tank through a first water pipe; the first water pipe is provided with a first valve and a first water pump; the top end of the electric heating water tank is connected with the right side of the bottom end of the heat preservation water tank through a second water pipe; the second water pipe is provided with a second valve and a second water pump. The efficient and energy-saving civil boiler using solar energy is small in size, safe, environmentally friendly, high in hot water efficiency and suitable for civil use, and has the heat preservation function.