The invention discloses an information hiding method of HEVC video based on Hamming code+1, which utilizes the Hamming code+1 algorithm formed by combining the (1,3,2) matrix coding algorithm and the LSBMR algorithm in steganographic coding, according to the The embedded three-bit secret information modifies the prediction mode to complete the information embedding, and embeds three-bit secret information in four consecutive 4×4 intra-frame luminance blocks, which not only ensures the hidden capacity, but also reduces the risk of video quality degradation caused by the modification of the prediction mode. Influence, which well guarantees the subjective and objective quality of the video, and greatly reduces the impact of embedding hidden information on the video stream; by analyzing the HEVC codec structure, for the prediction unit with a size of 4×4, the intra-frame prediction coding process The medium modulation prediction mode is the prediction mode with the smallest rate-distortion cost that meets the embedding conditions, and uses the Lagrangian rate-distortion model to adaptively select the prediction unit type of the coding unit. This hidden information embedding method can well ensure that the video subjective and objective quality.