EDTA-MgNa2 is a kind of stable water-soluble metal chelate, magnesium existed in a chelated state EDTA-MgNa2, used as separating agent, EDTA-MgNa2 is a kind of stable water-soluble metal chelate. EDTA-MgNa2can chelate multivalent ferric ion. Calcium and ferrum exchange forms the more stable chelate. EDTA-MgNa2can be used for foliar fertilizers.