The present invention discloses a preparation method of a polyaniline nanometer electrode material. The preparation method of the polyaniline nanometer electrode material is characterized in that the polyaniline nanometer electrode material is prepared by the steps of raw material selection, carbon cloth pre-processing, polyaniline electrochemical deposition, washing and vacuum drying. The advantages of the present invention are that by an in situ polymerization method, the polyaniline is deposited on a carbon fiber cloth with short beards by an electrochemical deposition method, thereby effectively enhancing the conductivity of an electrode material; the polyaniline prepared by the present invention is equipped with an unique pinhole structure, provides a larger contact superficial area, and enables the length of an electrolyte ion transmission path to be shortened effectively; the polyaniline and the carbon fiber cloth are combined effectively, so that a synergistic effect is generated between the carbon fiber cloth and the polyaniline, and the electrochemical performance of a super capacitor electrode is influenced remarkably.