In our present work, we report the synthesis of Sb-doped SnO2-coated TiO2 (TiO2@Sb-SnO2) conductive nanocomposites by hydrothermal method. Firstly, titanate whiskers were hydrothermally synthesized at 175 °C using sodium hydroxide and metatitanic acid as starting materials with a molar ratio of 4:1. And then, the TiO2@Sb-SnO2 nanocomposites were hydrothermally synthesized with the use of the as-synthesized titanate whiskers, tin tetrachloride, and antimony trichloride as starting materials at 185 °C. In the hydrothermal reaction process, Sb-doped SnO2 nanoparticles enhanced the phase transition from titanate to rutile TiO2. The oxidation states of tin and antimony elements are Sn4+, Sb5+, and Sb3+, respectively. TEM and HRTEM analyses indicated that the Sb-doped SnO2 nanoparticles with an average particle size of around 1.5 nm were coated on the surfaces of TiO2 nanoparticulates with an average particle size of around 20 nm. The TiO2@(1%)Sb-(10%)SnO2 nanocomposites had a minimum electric resistivity of 5.97 × 103 Ω·cm. Filling of the TiO2@Sb-SnO2 nanocomposites increased the electric conductivity of waterborne polyester films, endowing the polyester films with static electron dissipativity.