A facile in situ mechanical-chemical polymerization method for synthesis of polyaniline/halloysite nanocomposites was developed. Electron micrographs of the composites showed novel multi-holed clay nanotubes modified with a porous polyaniline nanolayer. After removing clay tube cores, polyaniline nanotubes can be obtained. Moreover, novel multi-holed clay nanotubes were obtained after removing polymer shells.