The streptavidin-biotin (SA-Biotin) system has a very high binding affinity (K =10^-15) and has a wide range of applications in the biological field.Streptavidin magnetic beads covalently pair SA proteins on the surface to efficiently bind biotinylated antibodies, nucleic acids, proteins and other ligand molecules. The product adopts superparamagnetic microspheres with uniform particle size and regular morphology, which is conducive to convenient and fast trapping of target molecules and magnetic separation. This product can be equipped with automated equipment for high throughput operation.