Abstract: A method for extracting residual videos in a DVR hard disk and deleted videos, including: 1) connecting and recognizing devices; 2) judging whether a file system can be recognized; 3) if so, parsing disk partitions and matching the file system; 4) scanning sectors one by one; 5) parsing video data, capturing and recording same; 6) enumerating a video list and displaying same; and 7) extracting videos. Parsing and data extraction can be conducted on all DVR hard disks of various types of various manufacturers, and files in the hard disks can be reorganized into valid, single-channel and continuously played video files; and useful video data can be parsed and screened out, thereby reducing human and material resources.