The invention discloses a system and method for repairing a bad display area of a liquid crystal display panel. The system for repairing the bad display area of the liquid crystal display panel comprises an image acquisition device, a distortion-free compression module, a storage and a color spot repair module, wherein the image acquisition device is used for acquiring data of images, containing the bad display area, of the liquid crystal display panel, the distortion-free compression module is used for carrying out difference operation on the collected data of the images to achieve distortion-free compression processing, the storage is used for storing the compressed data processed through distortion-free compression processing, and the color spot repair module is used for carrying out decompression processing on the compressed data stored in the storage, carrying out color spot repair on the decompressed original data of the images to generate feedback information, and sending the feedback information back to the liquid crystal display panel. According to the system and method for repairing the bad display area of the liquid crystal display panel, due to the facts that values of the images which will be stored in the storage, and contain data of the bad display area are processed through distortion-free compression and decompression, then, color spot repair is carried out, and the information is output to the liquid crystal display panel, the storage size of the storage can be reduced, the manufacturing cost is reduced, and the De-Mura processing effect cannot be reduced.