Design concept of a new method for externally anchored FRP sheet prestressed reinforcement, fully utilizing the characteristics of waveform toothed fixture anchors, using two ends fixed first and then middle tightened, forcing the geometric elongation of the FRP sheet to generate pre tension. Using the old bridge components removed from Chengdu–Chongqing Expressway, the experiment of externally anchored carbon fiber cloth prestressed reinforcement is carried out. The test results show that this method is very simple and convenient to apply prestress, and the technology is feasible. It does not need special tensioning equipment, and significantly improves the reinforcement effect. It has a very broad application prospect