The invention relates to a method for cleanly producing citric acid by coupling a calcium salt method with precipitation displacement. The method comprises the following steps: using calcium carbonate, magnesium carbonate or zinc carbonate as a neutralizing agent in the citric acid neutralizing step of a conventional calcium salt method, obtaining a calcium citrate and/or calcium monohydrogen citrate, magnesium citrate or zinc citrate solid after neutralization reaction and simultaneously obtaining CO2; then reacting calcium citrate and/or calcium monohydrogen citrate, magnesium citrate or zinc citrate with ammonium carbonate, sodium carbonate or potassium carbonate by utilizing precipitation displacement reaction to obtain a solution containing ammonium citrate, sodium citrate or potassium citrate and a calcium carbonate, magnesium carbonate or zinc carbonate precipitate; finally treating the solution containing ammonium citrate, sodium citrate or potassium citrate by utilizing the bipolar membrane electrodialysis technology to obtain a solution containing citric acid and a regenerated NH3, NaOH or KOH solution. The method has the beneficial effects that calcium sulfate waste residues are not produced; the method can be directly linked with the neutralizing step and achieve material closed recycling.