The utility model discloses a forming tool provided with a sunken pore plate and used for weaving a three-dimensional fabric. The device comprises upper and lower bottom plates, a pressing plate, a pressing plate reinforcing ring, a cover plate combination and a pore plate combination, the lower bottom plate is mounted on the rotary worktable; the upper bottom plate and the lower bottom plate areconnected through a linear bearing, a linear bearing sleeve and a central sleeve; the blind hole plate is positioned with the upper bottom plate through a pin; bolt fastening, the pressing plate reinforcing ring is fixedly connected with the pressing plate and then is clamped on the movable sliding table above the blind hole plate; the second pore plate is positioned with the pressing plate through a pin; bolt fastening, the two plates are separated by a sleeve; the first cover plate and the second cover plate are placed above the carbon rod; the first pore plate is connected with the cover plate through a pore plate fixing piece; counter bores for installing linear bearings are machined in the pore plate, the pressing plate and the cover plate and used for installing the linear bearings,all the plates are positioned through optical shafts and are coaxial, a weft insertion channel can be provided for a weft insertion sword of an automatic knitting machine, the overall yarn pressing function is achieved, the production efficiency is improved, the labor intensity is reduced, and the production period is shortened.