Carbon-fiber-reinforced polymer (CFRP) composites are widely used in bridge-strengthening applications, owing to their high strength-to-weight ratio, superior corrosion resistance, and exceptional fatigue performance. However, in desert areas with strong windblown sand activity, reinforced structures are consistently subjected to serious sand erosion and abrasion. The abrasive-particle-induced impacts on CFRP materials compromise their interfacial bonding integrity, thereby diminishing their structural-reinforcement effectiveness and safety. This study investigates the influence of wind-sand erosion on the mechanical properties of CFRP-concrete interfaces. The results of this work show that, as the erosion velocity increases, both the strain-distribution profiles and peak shear-stress locations at the interface progressively migrate toward the free end. Concurrently, the interfacial ultimate strain and peak shear stress decrease significantly, with maximum reductions of 26 % and 31 %, respectively. Increase in the erosion velocity, from 20 to 35 m/s, reduces the ultimate bearing capacity of the interface by 3-27 %. Similarly, as the erosion duration extends from 1 to 4 min, this ultimate bearing capacity reduces by 2-27 %. When considering the impact angle, a wind-sand angle of 60 degrees induces the most severe interfacial-property degradation, causing more than 30 % losses in the ultimate strain, peak shear stress, and load-bearing capacity. Furthermore, longer erosion durations and higher velocities promote microcracking, spalling, and fiber breakage within the epoxy layer. This shifts the interfacial failure mode from concrete detachment to resin-fiber separation, degrading the bond performance. Finally, new CFRP-concrete interface bearing capacity and bond-slip models incorporating wind-sand erosion velocity and attack angle as factors are established with high confidence. This study provides critical theoretical and technical foundations for CFRP reinforcement in desert environments.