The application discloses a nucleic acid fast extraction kit, which includes a mixed enzyme working solution, a cracking adsorption liquid, a detergent liquid, a rinsing liquid and an eluate liquid that are individually prepared. The mixed enzyme working solution includes protease K and lysozyme. The cracking adsorption liquid includes Gu-HCl, Tris-HCl, EDTA, isopropanol, SDS, Triton-100, beta-mercaptoethanol and sodium citrate. The detergent liquid includes LiCl, NaCl, MOPS and ethanol. The rinsing liquid is ethanol. The eluate liquid is EDTA and Tris-HCl. The kit is suitable for extraction of genomic DNA of whole blood, culture cell, tissues, saliva, G<-> bacteria and G<+> bacteria. The purity of extracted DNA is high, and the DNA is suitable for downstream digestion and PCR biological operation. The kit is stale in reagent property, can meet common laboratory demands and can overcome defects of toxicity, long time consumption and tedious operation of a traditional method.