The invention relates to a video encryption method incompatible with video coding based on a chaotic cryptography theory. The method comprises steps of dividing a video file into a video stream and anaudio stream: regarding the video stream as frames of image, encrypting based on 2D Arnold Cat mapping, a DNA encoding technology and a Lorenz hyperchaotic system, and adopting different encryption methods for Y, Cb and Cr channels of the image; using logistic mapping for audio stream encryption. A video stream is regarded as common image data to be encrypted, and compared with an encryption algorithm compatible with video coding to selectively encrypt sensitive information in a video, the security is enhanced; high-dimensional chaotic encryption is adopted, so that exhaustion attacks can beresisted; and the encrypted images are automatically synthesized into a video, so that the defect that the video cannot be played after being encrypted by a traditional incompatible video coding encryption algorithm is overcome. According to the method, various attacks such as strong attacks, statistical attacks and related attacks can be effectively resisted.