Near-net-size composite structure carbon fiber puncture preform

The utility model discloses a near-net-size composite structure carbon fiber puncture preform which comprises an X-Y direction composite structure and a Z-direction fiber vertically puncturing the X-Y direction composite structure. The horizontal section of the X-Y direction composite structure is a regular n-polygon with a hole in the center, n is equal to 4m, and m is equal to 2, 3, 4...; the Z-direction fibers are arranged in the X-Y-direction composite structure in a penetrating mode row by row. The method has the advantages that an octagonal prism (or a twelve-prism, a sixteen-prism and the like), hollow, near-revolution-body-shaped and near-net-size carbon fiber puncture preform can be directly woven and formed, secondary cutting is not needed, and raw materials can be saved; the use amount of Z-direction steel needles can be reduced, the puncture resistance is reduced, and forming of a large-size puncture prefabricated body becomes possible; the using amount of Z-direction steel needles is greatly redu