An image capturing device and a hybrid image processing method thereof are provided. The method is adapted to an image capturing device having a first lens and a second lens and includes the following steps. First, a scene is captured by the first lens and the second lens to respectively generate a mono image and a color image of the scene. Next, one of a mono image-based mode, a color image-based mode, and a color image-only mode is dynamically selected, and an output image is generated accordingly, wherein the mono image-based mode is to produce the output image by adding color image data onto the mono image, the color image-based mode is to produce the output image by adding mono image data onto the color image, and the color image-only mode is to produce the output image by only using the color image.