The invention discloses an image processing method and device. The method comprises the steps of obtaining an original image, wherein the original image comprises multiple original image macro blocksobtained by dividing the original image in advance; obtaining a corresponding new image containing multiple new image macro blocks based on processing the original image, wherein the new image macro blocks comprise original image macro blocks and filling macro blocks, data of the filling macro blocks is preset to be 0, at least one line of new image comprises the multiple original image macro blocks, and each original image macro block in the original image is in the line, behind each original image macro block and depended by the original image macro block, in the original image. According tothe technical scheme, the new image is obtained by processing the original image, each original image macro block in the new image is in the line, behind each original image macro block and dependedby the original image macro block, in the original image, that is, row dependence does not exist among the original image macro blocks in the same line, therefore parallel processing of a WebP algorithm can be accelerated, and the image processing time is shortened.