The powder fiberglass is wet-milled, dried and screened by a ball mill. It is suitable for reinforced thermoplastics, unsaturated polyester resins, epoxy resins and phenolic resins. When the glass fibre powder is mixed with resin, it penetrates quickly and has good dispersibility, which can give the material excellent mechanical properties. The hardness and crack resistance of the product are significantly improved, and the color of the product is bright and white.