The invention discloses a halftone image generation method based on sectioned error diffusion. The method comprises the following steps: step 1, segmenting an original image into a plurality of image blocks, respectively classifying adjacent image blocks on rows and lines into different groups, and dividing all the image blocks into four groups; step 2, in the four groups of images, sequentially carrying out halftone processing to each group of image blocks in an optional mode to obtain a final halftone image, wherein the halftone processing is carried out to all image blocks in the same group at the same time; when the halftone processing is carried out to each image block, firstly, setting a traverse path, and then carrying out quantization and error diffusion processing to each pixel in the current image block according to the traverse path. As the method processes all image blocks of the same group at the same time, the method has a strong ability of parallelization, can achieve high-speed and high-quality halftone processing, and can be applied to the printing industry and the field of digital display well.