The width can be customized in the range of 800~2800mm, and the thickness range is 0.04~0.22mm. The special milky white masterbatch and formula are selected, which have higher mechanical properties and strength than ordinary milky white films, and far exceed similar products in tensile elongation at break. It has the characteristics of good coverage, few crystal points, uniform film thickness and smoothness, and excellent coating processing performance. It is suitable for high-value protective film substrates such as glass mirrors.