AT-004F cementing plugging fiber is a kind of plugging fiber made of sodium borosilicate as the main material and silica as the auxiliary material after cutting. This product is white or gray fiber bundle, according to the length of fiber can be divided into: 5mm, 10mm and 19mm three kinds. The cement slurry with at-004f cementing fiber can improve the leakage resistance of cement slurry, increase the toughness and impact resistance of cement stone, and improve the cementing quality of leakage well or fracture leakage well.