A flame simulating device includes an upper part, a light source, a container and an oscillation device. The upper part has a flame element which freely swings relative to the upper part, and the light source located in the upper part emits light toward the flame-shaped portion. The container is located below the upper part and contains liquid therein. The oscillation device is located at the underside of the container and oscillates the liquid in the container to generate liquid vapor and liquid droplets, the liquid droplets hit and irregularly swing the flame element. The liquid vapor provides a foggy environment.
