The self-developed prestressed CFRP sheet anchoring and tensioning device is used to strengthen single-box single-chamber reinforced concrete simple-supported box beam common in engineering by mounted prestressed CFRP sheet strengthening technology, and the bending test is carried out, the failure mode, ultimate bearing capacity, deflection deformation law and section strain distribution of the specimens under different strengthening methods were analyzed. The test results show that the specimens strengthened with mounted prestress can improve the bearing capacity more obviously, which can effectively prevent the occurrence of debonding failure; the high performance of carbon fiber material was fully exerted, the strain of the box beam after the strengthening is approximately linear, the plates in upper and lower flange have obvious shear hysteresis effect.
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