One object of the present invention is to provide a method for preparing an organic acid calcium salt (calcium citrate, calcium lactate) which has a high degree of ionization and is easily dissolved in water. Pre-treatment by mixing at least one selected from the group consisting of calcium carbonate and calcium oxide in a solvent to achieve the above object by ultrasonic irradiation; Mixing the organic acid with the solution of the step to form a mixture; And irradiating ultrasonic waves to the mixture formed by mixing the organic acid. It provides a method for producing an organic acid calcium salt comprising a. According to this, there exists an effect which can provide the organic acid calcium salt which has high ionization degree and can dissolve several times more than the solubility which each compound has. In addition, the manufacturing method of the organic acid calcium salt has an excellent effect that the process and equipment can be prepared in less than 10 minutes.
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