The invention discloses a method for preparing a titanium dioxide nanorod/polypyrrole/dacron compound fabric. The method comprises the steps of cleaning and drying a dacron fabric, and then placing the dacron fabric in alkali aqueous ammonia for surface roughness treatment; then soaking the dacron fabric in an oxidization bath, and adding pyrrole monomer aqueous solution dropwise so that a polypyrrole layer can be deposited on the surface of the dacron fabric; soaking the dacron fabric with polypyrrole deposited on the surface in prepared titanium dioxide sol, conducting lifting, drying and hydrochloric acid treatment so that a titanium dioxide seed crystal layer can be deposited on the surface of the dacron fabric, and conducting hydrochloric acid treatment and sulfuric acid treatment in sequence; preparing titanium dioxide nanorod growth-promoting media, and adding an excessive amount of titanium source so that titanium dioxide nanorods can be deposited and grown on the surface of the treated dacron fabric. Combination of the one-dimensional titanium dioxide nanorods and polypyrrole on a substrate of a flexible fabric is realized, and the obtained compound fabric has self-cleaning, anti-statistic, photocatalytic degradation and pollutant filtration functions and can be used as a flexible electrode and a flexible supercapacitor.