The present invention provides a method and device for generation of a depth map. The method comprises: converting a received original image to an original gray-scale map; according to a preset down-sampling multiple, performing down-sampling of the original gray-scale map, and obtaining a down-sampling gray-scale map; according to a setting pixel range, dividing the down-sampling gray-scale map into a plurality of image blocks; according to the gray values of pixel points and a preset communication direction, determining at least one communicated image block in a plurality of image blocks, and calculating the weighted values between adjacent communicated image blocks; based on the determined weighted values, determining at least one communication area in the at least one communicated image block; aiming at each determined communication area, determining the depth value of each communication area; based on the depth value and the original gray-scale map of each determined communication area, obtaining a pre-processing depth map; and according to the original gray-scale map, performing filtering of the pre-processing depth map, and obtaining the depth map of the original image. The present invention further discloses a corresponding device for generation of a depth map.