To solve the problems of complex fiber structure and high manufacturing difficulty in existing methods of improvingthe birefringence of optical fibers, a hollow-core anti-resonant fiber with high birefringence characteristics is designed. Thecladding of the optical fiber is composed of a cladding ring, four half-tubes, and a pair of small circles nested inside the half-tubes.The finite element method is used to analyze the influence of the structural parameters of the fiber on its birefringence, transmission loss, confinement loss, and absorption loss. The simulation results show that changing the diameter of the half-tube has asmall effect on the birefringence. By adjusting the thickness difference between the horizontal and vertical half-tubes in the fiber,the fiber can achieve high birefringence, with a birefringence greater than 1.5×10-4 over a wide frequency range of 0.25 THz,while maintaining a transmission loss less than 10 dB/m.