In the multi-branch hole drilling operation, the directional drill pipe joint frequently fails due to repeated bending. The finite element analysis method was used to simulate the mechanical behavior of the directional drill pipe joint under bending load, and the stress distribution law of the directional drill pipe joint was obtained. Based on this, a new type of anti-bending drill pipe joint structure was proposed, and the difference between the bending and bending load resistance performance of the new type of anti-bending drill pipe joint and the ordinary drill pipe joint was compared by the finite element model. The results show that under the same bending angle, the maximum stress value of the anti-bending drill pipe joint is reduced by 27％-60％. Under the action of 100 kN transverse force, the maximum stress value of the anti-bending drill pipe joint is reduced by more than 99 MPa. It can be seen that the new anti-bending drill pipe joint is superior to the ordinary drill pipe joint in terms of bending performance and bending load. Through the drill pipe bending test, the detailed stress distribution data of the joint position are obtained. The comparative analysis shows that the error between the experimental data and the numerical simulation results is controlled within 12.52％, which verifies the effectiveness of the numerical simulation method. The research results provide an optimization scheme for the design of directional drill pipe joints, which is of great significance to reduce the possibility of joint failure in directional drilling operations and improve the safety and efficiency of operations.