The invention belongs to the field of graphic information processing, and provides a decimal lookup table generation method for video stitching. The decimal lookup table generation method for video stitching comprises the steps of coordinate projection, feature point detection and matching, filtering of erroneous matching points and construction of a decimal lookup table. According to the decimal lookup table generation method for video stitching, first, coordinate projection is conducted, wherein images to be stitched are projected to a standard coordinate system; then, feature point detection and matching is conducted, and the erroneous matching points are filtered; finally, the decimal lookup table is constructed and clipped according to the size of a stitched video, and a stitched video image is obtained by means of the decimal lookup table through bilinear interpolation. According to the decimal lookup table generation method for video stitching, a one-to-one mapping relation between shot images and stitching image coordinates can be obtained to meet the requirement for instantaneity of video stitching; meanwhile, the decimal lookup table is more natural than an integer lookup table in transition, and therefore an ideal visual effect can be achieved.