DNA extraction kit is a biological teaching tool that allows students to extract and purify DNA in a laboratory environment. This kit usually contains all necessary reagents and materials. In chemistry teaching, DNA extraction kits allow students to personally operate and extract DNA from common biological samples such as oral cells, plant leaves, fruits, etc. Through this process, students can intuitively understand the physical and chemical properties of DNA, as well as the basic techniques of molecular biology experiments. The DNA extraction kit is a very valuable tool in biological experimental teaching. It can not only stimulate students' interest in learning, but also cultivate their experimental skills and scientific exploration spirit.