Disclosed are an image display method applied to a splice display screen included by splicing multiple screen bodies along a first direction, and a video processing device. The image display method may include: an output size in the first direction, of the splice display screen is determined according to resolutions and dot spacings in the first direction, of the multiple screen bodies; an input size in the first direction, of an input source is determined according to a resolution in the first direction, of the input source; an image scaling ratio in the first direction of the splice display screen is determined according to the input size and the output size; and display control parameters in the first direction, of the each screen body are determined according to the image scaling ratio.