The invention discloses a method for generating a calcium carbonate clear raw sugar solution by using boiler flue gas sectional carboxylic acid saturation, which comprises the following steps: adding a calcium bicarbonate saturated solution into a raw sugar solution, adding a proper amount of monocalcium saccharate solution to generate abundant non-sugar impurities in the calcium carbonate adsorption raw sugar solution through the reaction between the calcium bicarbonate and monocalcium saccharate, and introducing a right amount of CO2-containing boiler flue gas to react with effective CaO in the unreacted monocalcium saccharate so as to generate calcium carbonate, thereby regulating the pH range of the sugar solution. The method can solve the key problems of low purity, great concentration fluctuation and low absorptivity in the flue gas CO2 application process, and can reduce the boiler flue gas sugar solution saturation time and foaming amount. The generated high-quality calcium carbonate can effectively adsorb non-sugar impurities in the sugar solution. The method can reduce the discharge amount of CO2 in the flue gas, thereby protecting the ecological environment. The method can lower the enterprise cost and enhance the economic benefit.