Taking the external prestressed reinforcement project of Yongjiang Bridge in Nanning City as the background, a detailed analysis of the anchoring structure anchored in the general beam section of the original structure was carried out by using the spatial finite element analysis method. According to the obtained spatial stress distribution characteristics, the structural measures for local reinforcement of the anchoring structure were considered The setting of channel steel and rebar can effectively reduce the stress concentration of the concrete at this position, make the stress distribution tend to be uniform, and the local stress can meet the requirements of the standard limit. At the same time, the engineering practice shows that the finite element detail analysis method is more in line with the actual stress characteristics of the anchoring structure, and the calculation results and local reinforcement measures can be used as an important reference for the design and construction of similar external prestressed reinforced bridge anchoring structure.