The invention provides a video data integrity detection method. The video data integrity detection method includes the steps: 1, extracting timestamp information of key frames of video data when a storage device receives the video data; 2, forming an index according to the timestamp information obtained in the step 1; 3, judging whether the index is continuous or not in terms of time; if yes, confirming integrity of the video data; and if not, confirming non-integrity of the video data; and 4, processing the integral video data, finally forming integrity detection information, and caching the information into a memory of the PC machine. The index of video files is based on the key frames, integrity detection is based on the index of the key frames, and accordingly high-precision integrity detection is achieved. Graphic displaying allows users to see the integrity condition of the video data and provides the users with fine user experience.