NOVELTY - Iron-based conductive polymer modified composite catalyst preparation involves diffusing carbon material in water, methanol or chloroform in mass ratio of 1:10-30, to obtain a suspension. The suspension is mixed with glacial acetic acid or hydrochloric acid, to adjust pH value to 2-3. The obtained suspension is stirred at room temperature for 20-60 minutes, pyrrole or thiophene is added to suspension, and suspension is stirred for 10-20min. The mass ratio of pyrrole or thiophene and carbon material is 1:5-1 to obtain a reaction mixture.    USE - Method for preparing iron-based conductive polymer modified composite catalyst for use in fuel battery, particularly direct sodium borohydride fuel battery and direct hydrazine fuel battery.    ADVANTAGE - The iron-based conductive polymer modified composite catalyst preparation method is simple and cost effective, enables to prepare iron-based conductive polymer modified composite catalyst with uniform sizes and ensures improved battery performance.    DETAILED DESCRIPTION - Iron-based conductive polymer modified composite catalyst preparation involves diffusing carbon material in water, methanol or chloroform in mass ratio of 1:10-30, to obtain a suspension. The suspension is mixed with glacial acetic acid or hydrochloric acid, to adjust pH value to 2-3. The obtained suspension is stirred at room temperature for 20-60 minutes, pyrrole or thiophene is added to suspension, and suspension is stirred for 10-20 min. The mass ratio of pyrrole or thiophene and carbon material is 1:5-1 to obtain a reaction mixture. The reaction mixture is mixed with anhydrous ferric chloride, where anhydrous ferric chloride is a metal source for initiators and catalyst for polymerization reaction and mixture is stirred for 1-10 hours. The mass ratio of the anhydrous ferric chloride and carbon material is 1:1-10. A basic sodium borohydride solution is slowly added to the mixture and stirred for 40-90 minutes, to maintain the molar mass ratio of sodium borohydride and anhydrous ferric chloride as 1-2:1. The obtained reaction mixture is washed and filtered by deionized water, and vacuum dried for 8-10h at 80-90 degrees C, to obtain composite catalyst.