The invention relates to a high-capacity image steganography method, which is used for embedding the secret information into a carrier image, and is characterized by comprising the following steps of1, grouping the carrier image and the secret image; 2, respectively extracting a group of carrier images and a group of secret information according to a sequence, and then respectively embedding onegroup of secret information into one group of carrier images according to the methods recorded in the following steps 1 and 2 until all the groups of secret information is completely embedded, whereinthe grouped carrier image in which the group of secret information is embedded is called as a final secret carrying grouped image, and combining all the final secret carrying grouped images to obtaina final secret carrying image. Compared with the prior art, the method has the advantages that the secret information is embedded into the lowest plane of the image, and meanwhile, the secret information is embedded into the seventh plane of the image, so that the steganography capacity is improved by two times; meanwhile, the histogram characteristic distortion of the image can be kept optimally.