The present invention discloses polymer intercalation calcium-aluminum hydrotalcite that is used as the additive for the concrete and a method for producing the polymer intercalation calcium-aluminum hydrotalcite. The chemical formula of the polyacrylic acid root intercalation calcium-aluminum hydrotalcite is [Ca2Al(OH)6]n*(CH2CHCOO)n*nmH2O, wherein, n is the polymerization degree of the sodium polyacrylate and is valued in the range of 5 to 800; m is the quantity of the crystal water and is valued in the range of 0.5 to 10. The preparation steps: CaAl-PAAS is prepared with the preparation methods of the conventional hydrotalcite material such as double-dropping method, the neacleation/crystallization separation method and the ion exchanging method, and then the XRD and IR characterizations are performed. The present invention has the advantages that the preparation and the characterization problems of the polymer anion intercalation calcium-aluminum hydrotalcite are resolved.