The present invention discloses a stereo display device which uses an electric driving liquid crystal lens. The stereo display device comprises the following components: a display panel; a light source used for radiating light; and an electric driving liquid crystal lens which is installed between the display panel and the light source and is provided with a reflecting electrode for intercepting one part of light radiated from the light source. The electric driving liquid crystal lens can execute broad visual angle display or narrow visual angle display according to whether the voltage is exerted on the electric driving liquid crystal lens.