In order to address the problems of low collaborative reliability and bulky structure of conventional slip assemblies in snubbing operations, an integrated bidirectional load-bearing slip was innovatively proposed. Based on the multi-body elastoplastic contact governing equations of the slip system, a finite element model for calculating the ultimate load-bearing capacity of the slip was established, with a model error of less than 5%. This model was used to investigate the effects of wrap angle, tooth height, inclination angle, and number of segments on the ultimate load-bearing capacity of the integrated bidirectional load-bearing slip and the Mises stress distribution on the tubing. The results show that increasing the wrap angle (from 60° to 84°) improves the ultimate load-bearing capacity of the slip and enhances the uniformity of tubing stress distribution; the tooth height has a critical optimal value, where a tooth height of 4 mm enhances the single-tooth shear resistance while effectively reducing stress concentration; an excessively large inclination angle reduces the load-bearing capacity, with a sharp drop at 12°; the optimal range for the number of segments is 6 to 8, while too many segments lead to insufficient contact area per segment and consequently local overload. It is concluded that this research can provide theoretical guidance for the design and optimization of integrated bidirectional load-bearing slips.