This kit uses magnetic bead-based technology for nucleic acid purification. It utilizes functional groups on magnetic beads to enrich nucleic acids from agarose gel onto the bead surface.The beads are then washed to remove impurities, and then separate magnetic beads with magnetic separation device, so as to quickly separate and purify DNA from samples. The whole process does not require the use of phenol, chloroform and β-merphytoethanol,, safe and non-toxic, and the use of paramagnetic magnetic beads, suitable for high-throughput automated extraction.