The invention discloses an intercalation nanocomposite material of a polyaniline or a polyaniline derivative, and inorganic clay by mechanochemical polymerization method. The method comprises the following steps of: (1) placing inorganic clay into a round-bottom flask with a branch port, vacuum-pumping, fully filling with argon, adding aniline or an aniline derivative, wrapping a tin foil out of the round-bottom flask after magnetically stirring, and stewing out of light under normal temperature, to obtain a blending fluid suspension; (2) grinding the blending fluid suspension, adding an oxidizing agent, covering a mortar with a tunnel in a grinding process, introducing argon into one end of the tunnel, continuously grinding, until to become atropurpureus completely; and (3) washing after reaction, filtrating, and vacuum-drying until constant weight, to obtain the intercalation nanocomposite material of inorganic clay. The prepared nanocomposite not only makes polyaniline or the polyaniline derivative have good dispersibility and high mechanical strength, but also raises water solubility and processing temperature of polyaniline or the polyaniline derivative. The method has advantages of simple preparation method and high polymer intercalation rate, and has a practical application meaning.