Prepn process of amino acid-calcium chelate

The present invention discloses preparation process of amino acid-calcium chelate. Through converting strong acid type cationic exchange resin into calcium type with calcium ion, reacting in column with mixed solution of leucine and sodium hydroxide in the molar ratio of 1 to 0.5-2 at normal temperature, collecting the effluent at the flow rate of 0.05-1 BV/hr, and vacuum concentration to crystallize leucine-calcium chelate. The leucine-calcium chelate has high water solubility, high absorption rate, no stimulation to gastrointestinal tract and other features, and can meet the requirement of human body in replenishing calcium and amino acid. The preparation process has the advantages of low production cost, high conversion rate and high product purity, and is suitable for industrial production.