Grinding filter is an experimental tool used for sample preparation in biology teaching. It combines the functions of grinding and filtering, and can effectively extract intracellular substances such as proteins, nucleic acids, etc. from plants, animal tissues, or microorganisms. In biology teaching, students can use grinding filters to learn how to prepare cell extracts, perform pre-processing work for molecular biology experiments, help students understand the principles and methods of cell structure and cell fragmentation, and master the basic skills of biological sample processing. The use of grinding filters can not only improve experimental efficiency, but also cultivate students' experimental operation ability and scientific research methods.