Silica anti-blocking agent is a synthetic amorphous silica white powder, produced through a special process. Its surface is specially treated to ensure good compatibility with plastics, featuring a porous structure and high specific surface area particles. This anti-blocking agent boasts excellent dispersibility, requires a low addition amount, and does not need grinding, thereby maintaining the transparency and strength of plastic films while significantly enhancing their anti-blocking and slip properties. With a narrow particle size distribution, it is non-toxic, pollution-free, and contains no volatile or extractable substances, ensuring the quality of packaged goods. It also enhances the anti-blocking and anti-creep properties of films on high-speed packaging lines and provides reinforcement. For PET films requiring extremely low moisture content, this product can be dried at high temperatures. The unique properties of silica reduce the exposure of molecular chains during polymer processing, effectively eliminating macromolecular entanglement when two films come into contact, solving the anti-blocking issue, reducing adhesion during friction with objects, and improving slip performance.