<p>The composite strengthening method of fiber-reinforced polymer (FRP) grid and inorganic bonding materials has exhibited excellent repair and strengthening effects on concrete infrastructures subjected to harsh environments and service loading. Existing research has primarily concentrated on non-prestressed FRP grid strengthening, which poses a challenge in efficiently improving structural stiffness and crack resistance. The main challenge to current research and applications of prestressed FRP grid strengthening is the absence of effective FRP grid anchorages. This study analyzed the mechanical performance and anchorage efficiency of the prestressed FRP grid anchorages numerically. The stress analysis of the FRP grid anchorage system was carried out. The influence of tension eccentricity, bolt arrangement, prestressing force, and inhomogeneity of material properties were considered. The results indicate that reducing tension eccentricity and adjusting bolt arrangement can effectively improve the uniformity of stress on the longitudinal grid bars, leading to enhanced anchorage efficiency. The transverse grid bars confine the longitudinal grid bars in the stress transfer region of the anchorage plate, leading to significant shear stress. This is another crucial factor that reduces anchorage efficiency.</p>