The utility model discloses a civil boiler with a reinforced energy-saving device. The boiler is composed of a hearth body, a stove rack and a chimney base; the hearth body, the stove rack and the chimney base are of jacket structures; the jackets of each component are mutually communicated; (-shaped reinforced heat-absorbing tubes are uniformly arranged at the annular inner wall of the hearth body, and a heat collecting tube is arranged between the upper and lower inner walls of the chimney base. The civil boiler has the beneficial effects that the (-shaped reinforced heat-absorbing tubes are added to the inner wall of the jacket at the part with the highest temperature inside the hearth body, so that the temperature of hot water for heating can be more rapidly improved, and a right-angle baffled heat collecting tube between the upper wall and the lower wall of the chimney base can effectively reduce the exhaust temperature, so as to further achieve the fuel-saving effect.