The carbon fiber precursor is non-destructively expanded and then warp and weft knitted. The weaving process has uniform tension, which solves the problems of deviation and deformation in the prepreg process. The fabric has a smooth surface. The warp and weft yarn of widened carbon fiber fabric has very small degree of buckling in the fabric, reduces the bending and "grid" phenomenon of fiber bundle in the fabric, and at the same time improves the surface flatness of the fabric, which enable the composite material has high fiber volume content and superior mechanical properties.