The invention relates to the field of remote-sensing image segmentation, and discloses a method of automatic construction of a remote-sensing image segmentation reference library. The method of automatic construction of the remote-sensing image segmentation reference library includes: step 1, screening public-source vector data to remove ground objects of which ground object areas are smaller thana preset area; step 2, carrying out registration superposition on a remote-sensing image and public-source vector data after screening to obtain A; step 3, clipping the remote-sensing image in the Ainto a plurality of preset-pixel-size small-range image blocks, setting the small-scale image blocks as units, judging, through image coordinates, whether the public-source vector data are located inimage block ranges, and generating masks of which sizes are the same as sizes of the original image blocks; and step 4, combining the masks and the original image to obtain the remote-sensing image segmentation reference library. According to the method, problems that in the prior art, efficiency of constructing reference libraries by manual labeling is low, and scales are smaller at the same timeare overcome, and automatic construction of the remote-sensing image segmentation reference library is realized.