The invention discloses a method for preparing an antibacterial antistatic finishing agent and belongs to the technical field of fabric finishing agents. The method comprises the following steps: uniformly mixing polyethylene glycol terephthalate, isopropanol and octanol, adding dihydroxytoluene methacrylic acid, and performing heating reflux; addingphenoxy polyphosphazene into a reactant after heating reflux, and heating for 2-4 hours so as to obtain a mixture A; stirring nano titanium dioxide, nano silicon dioxide, hydroxyethyl ether chitosan and water at a high speed till uniform mixing soas to obtain a mixture B; putting the mixture A into the mixture B, adding clove essential oil, and stirring at a low speed; cooling, adding sodium bicarbonate, stirring, and further cooling to the room temperature, thereby obtaining the antibacterial antistatic finishing agent. The antibacterial antistatic finishing agent prepared by using the method is good in water dissolubility, good in thermal resistance and acid-alkali resistance, good in antistatic effect and antibacterial effect.