A video signal processing method and a camera device. The method includes obtaining a video signal, and splitting several frames of images in the video signal into two or more sub-images; performing first processing on the two or more sub-images of the several frames of images using two or more image sensor processor (ISP) processing units; and outputting the processed two or more sub-images of the several frames of images. The present invention can improve resolution of output images, make images at joints clear, and implement an ultra-high resolution camera, thereby avoiding deficiencies such as image overlapping or missing at a seam, color difference, and out of synchronization that occur because an existing ultra-high definition video camera system uses a plurality of cameras to perform image splicing.