Buckle-anchored beams are widely used in bridges and building structures, but their local stress concentration problem seriously affects the safety and durability of the structure. Buckle-anchored beams are often used in domestic bridge construction; One is ordinary buckle-anchored beam, and the other is buckle-anchored beams reinforced with stiffeners at both ends. In this paper, the finite element analysis method is used to study the influence of stiffener plate and stiffener plate thickness on the stress distribution of buckled anchor beam. MIDAS/FEA/NX finite element software is used to establish a three-dimensional finite element model of the buckled anchor beam, analyze the stress distribution and spatial deformation characteristics of the buckled anchor beam with and without stiffening plate, and study the effect of stiffener thickness on the stress distribution of the buckled anchor beam at the same time. The results show that the stiffened ribs can significantly reduce the local stress concentration coefficient of the buckled anchor beam, improve the uniformity of stress distribution, and improve the overall stiffness and stability of the structure and reduce the deformation. In addition, the thickness of the stiffener plate also has a certain influence on the improvement effect, and the reasonable arrangement can further optimize the stress distribution. This study provides an important theoretical basis and engineering guidance for the design and optimization of buckling anchor beams.