The invention provides a fullhole logging image generation method. The method comprises steps that logging electrical imaging data in a target window scope is acquired; gray processing on the logging electrical imaging data in a target window scope is carried out to acquire a gray image; a to-be-filled area on the gray image is determined, and a filling center point is selected on the to-be-filled area; a to-be-filled block is determined on the basis of image texture characteristics within a preset texture detection scope surrounding the the filling center point; multiple candidate filling blocks are selected from the gray image on the basis of the size of the to-be-filled block, similarities of the multiple candidate filling blocks and the to-be-filled block can be acquired through calculation on the basis of an average pixel gray of the to-be-filled block; one candidate filling block having highest similarity with the to-be-filled block is selected to carry out image filling for the to-be-filled block. The method is advantaged in that more-complex and more-changeable stratum images can be processed to acquire gray images, better data accuracy and reliability are realized, and calculation efficiency is higher.