The work aims to design a set of automatic screening equipment to achieve the automatic screening and elimination of defective products. Combined with fiber orientation probability density functions and continuum mechanics theory, the mechanical properties of suture were established by analyzing the suture area. To ensure that the pressure formed on the surface of the bottom suture areas of the screening mechanism’s vacuum chuck group and woven bag met the requirements, the mathematical model for vacuum degree, air permeability and time was established. The relationship between mechanical characteristic parameters, system vacuum, air permeability and time was derived. According to the relationship between the parameters, a solid model was developed by three-dimensional drawing software Pro/E. Then relevant control components were selected to design the equipment structure and build the control system. The automatic screening system for defective woven bag can screen and eliminate the products with suture defects, and greatly improve the production efficiency and reduce the production cost of the woven bag.