Phytic acid (C₆H₁₈O₂₄P₆, Phy) is the principal storage form of phosphorus in many plant tissues, especially bran, corn and seeds. Herein, high protective and stabile polypyrrole (PPy) films were directly electro-synthesized on Cu from aqueous phytic acid solution. The electrodeposition process was monitored with an electrochemical quartz crystal microbalance (EQCM), while the prepared PPy films were characterized by means of SEM, FT-IR and Raman spectroscopy. It was indicated that the growth of these films was facilitated by the initial oxidation of the Cu-electrode in the phytate solution to generate a Cu-phytate pseudo-passive layer. After that, highly adherent and homogenous polypyrrole was facilitated were electrodeposited on Cu in the phytic acid solution. Corrosion protection property of the PPy films were examined through immersion test in 3.5%(mass fraction)NaCl solution in terms of the amount of Cu ions dissolved from the PPy covered Cu during immersion, which presented the excellent stability and corrosion protective ability of the PPy films. Among others, the PPy film synthesized from the pH=4 phytic acid solution exhibited the best protective performance. EQCM-CV tests indicated that the PPy film doped with phytate anions, acting as cationic perm-selective membrane, can effectively inhibit the diffusion of Cl^- to the substrate and therewith improve the anti-corrosion property.