The invention provides a synthetic method of electrode material polyaniline. The synthetic method comprises the following steps of: (a) dissolving aniline into a perchloric acid solution, and reacting at below 10 DEG C in the presence of ferric sulfate or manganese dioxide, thereby obtaining reaction liquid; and (b) dropping a perchloric acid solution with dissolved ammonium persulfate in batches in the reaction liquid obtained from the step (a), and reacting continuously at below 10 DEG C, thereby obtaining the electrode material polyaniline. According to the invention, ferric sulfate or manganese dioxide as well as ammonium persulfate are taken as oxidizing agents for complex use; perchloric acid is taken as a reaction medium, and the reaction temperature is controlled to be below 10 DEG C; the synthetic technology enables the productivity and capacity of polyaniline during the whole synthetic process to be much high, solves the problems of low productivity and poor capacity of a traditional method, and is suitable for industrial production; and further, according to the invention, activated carbon with excellent conductivity and adsorption is added during the synthetic process, so that a traditional chemical oxidation method is changed into an electrochemical oxidation method, and meanwhile, the utilization ratio of the electrode material is improved.