The invention discloses a video coding method, a video decoding method, a video coding device, and a video decoding device, which are used to improve video image quality. The video coding method comprises steps that a to-be-coded image is compared with a comparison image to acquire a first movable area, and the comparison image is the adjacent image previous to the to-be-coded image; a corrected movable area is determined according to the first movable area and the second movable area, the second movable area is determined according to a result of comparing the comparison image with the adjacent image previous to the comparison image; the image of the corrected movable area is coded by using a first video coding unit; and images of non-movable areas except the corrected movable area are coded by using a second video coding unit.