The invention discloses a method for preparing conductive titanium dioxide whiskers. The method comprises the following steps: mixing a potassium salt and titanium dioxide, calcining, boiling for 1-24 hours with water and drying, thereby obtaining a solid A; pickling the solid A in a hydrochloric acid solution for 1-12 hours, filtering, washing, drying and calcining the solid, thus forming the titanium dioxide whiskers; dissolving a tin salt and an antimonic salt in water, thereby obtaining a mixed solution B; pulping the titanium dioxide whiskers in water, performing ultrasonic treatment for fully dispersing, thereby obtaining titanium dioxide suspension; dropwise adding the mixed solution B into the titanium dioxide suspension, regulating the pH value to 1-4 by using 0.01-10mol/L alkali liquor, thereby obtaining milk white turbid liquid; filtering, washing and drying the turbid liquid, and grinding into particles; and performing high-temperature treatment at the temperature of 400-800 DEG C for 1-5 hours, thereby obtaining the conductive titanium dioxide whiskers. The conductive titanium dioxide whiskers obtained by the invention have the diameter of 0.1-0.3 micron and the length of 0.4-5 microns and are excellent in conductivity and uniform in morphology.