An energy-saving environmentally friendly civil boiler comprises a left boiler body and a right boiler body, wherein the left boiler body is a combustion furnace; the right boiler body is a heat exchange filtering furnace; the left boiler body is connected with the right boiler body through a smoke and fire tube; a combustion cavity is formed in the middle of the inside of the left boiler body; afire grate is arranged at the bottom end of the combustion cavity; an ash chamber is formed in the lower end of the fire grate; a heat exchange cavity is arranged in the middle of the inside of the right boiler body; a filtering cavity is formed in the upper end of the inside of the right boiler body; the bottom end of the right boiler body is supported by a supporting base; the heat exchange cavity is connected with the filtering cavity through a smoke discharging tube with a smoke discharging fan; a tube at the right end of the smoke discharging tube is inserted into the filtering cavity; asmoke discharge tube is arranged on the right side of the top end of the filtering cavity; a heat exchange water inlet tube and a steam tube are arranged at the upper end of the right side of the heatexchange cavity; and a heat exchange water outlet tube is arranged at the lower end of the right side of the heat exchange cavity. By the energy-saving environmentally friendly civil boiler, heat energy generated by combustion of coal can be utilized effectively, furthermore, waste heat in smoke generated after combustion of the coal can be effectively used for heat exchange, and thus, heat lossratio is reduced.