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In order to make the video encryption technology have a better encryption effect, based on the original AES encryption algorithm, through the selection of encryption elements, motion vector encryption scheme design, DCT change coefficient encryption scheme design three parts of the analysis and experiment. After the subsequent simulation verification, the key sensitivity has been well improved; In terms of video quality, the RGB histogram of the improved AES algorithm shows that its encryption effect and decryption and restoration effect are good. Through comparative analysis, the improved AES algorithm has the smallest SSIM and lower PSNR value, that is, the encryption effect is relatively better. After calculation, it can be seen that the percentage of encoding time increases by 0.23%, and the percentage of decoding time increases by 8.56%. The parameters such as NPCR, UACI and correlation coefficient of video frame pixel pairs before and after encryption are respectively tested, and it can be seen that the improved video encryption has the best security performance compared with previous encryption methods. From the above analysis, we can see that the improved video encryption has the best effect.