The invention discloses a video steganography method based on H.265 standard distortionless drift. The video steganography method comprises secret information embedding and extraction; in an embedding phase, obtaining an original video source file and to-be-embedded secret information, and performing binary, information termination bit and other preprocessing on the secret information; determining an embedding position according to a prediction mode during video encoding, and embedding the preprocessed secret information until the information termination bit is identified; and in an extraction phase, obtaining a carrier video code stream file transmitted by the network, decoding the video code stream, and extracting the embedded secret information on the position corresponding to the embedding part until the information termination bit is identified; and restoring the extracted information to obtain original secret information. By adoption of the method, the distortionless drift of the video steganography is realized, good PSNR is realized; and the hiding position of the secret information has a high frequency domain residual high frequency coefficient, and thus the carrier video BD-Rate increase amplitude is very small.