The Nucleic Acid Extraction Kit uses a unique formula to release nucleic acid from samples and through efficient lysis and proteinase K treatment, the silica membrane specifically adsorbs nucleic acid in a high salt and low pH environment, while washing the nucleic acid and remove proteins, inorganic salt ions and many organic impurities, thus achieving high-quality nucleic acid extraction. It can be well applied to nucleic acid extraction for manual operation or high-throughput automated samples.