The work aims to introduce tetraaniline/carbon nanotubes composites (TC) into the polymer coating to form a passive layer on the surface of the metal by virtue of electrochemical activity of the composite material to improve the corrosion resistance of the coating. A cathodic electrophoretic coating was prepared from 2-(dimethylamino) ethyl methacrylate (DMAEMA), N-(hydroxymethyl) acrylamide (NMA), 2-hydroxyethyl methacrylate (HEMA), 2-ethylhexyl acrylate (EHA), and styrene (St). Tetraaniline/carbon nanotubes composites (TC) was prepared by π—π interactions, and introduced into the above cathodic electrophoretic coating, which was prepared on the metal surface by electrodeposition. The electrochemical test results indicated that the electrochemical activity of the composite was optimal when the amount of carbon nanotubes added was 50% of the aniline tetramer. The electrochemical activity of TANI disappeared when pH>4, while TC still maintained some electrochemical activity. And optical micrographs showed that as the amount of composite added increased, the phenomenon of agglomeration was obvious. The dispersibility of TC in the resin matrix was the best when the mass ratio of TC was 3wt%. The polarization curves also showed that the anticorrosion of the coating was optimal when the mass ratio of TC was 3wt%. The prepared composites have redox activity at a wide pH. Adding it to the electrophoretic coating improves the corrosion resistance of the coating and the resulting coating was smooth and flat.