The invention discloses an electrolytic polishing method for titanium alloy. The electrolytic polishing method is used for electrolytic polishing treatment of titanium alloy surfaces. The electrolytic polishing method adopting neutral electrolysis and liquefaction for the titanium alloy aims to overcome the shortcomings that existing electrolytic polishing solutions of the titanium alloy contain hazardous substances and pollute the environment. According to the electrolytic polishing method, deionized aqueous solutions of sodium tartrate are adopted as electrolytic polishing solutions, and the bright and clean titanium alloy surfaces can be obtained by controlling the concentration of the electrolytic polishing solutions, the polishing voltage and the polishing time.