The invention relates to a method for reinforcing a reinforced concrete structure by using a prestressed hose clamp. The method comprises the following specific steps of: 1) arranging prestressed hoseclamps at equal intervals outside the reinforced concrete structure, and pre-tightening hose clamp screws by using a universal hose clamp batch or a straight line; 2) fastening the pre-stressed hoseclamp by using a torque wrench, and setting a fastening torque value as a preset value; 3) considering the deformation of the reinforced concrete structure and the moment attenuation during the installation of the prestressed hose clamp, secondarily fastening the prestressed hose clamp; 4) after fastening is completed, marking with a black marking stroke line; and 5) checking whether the prestressed hose clamp has a thread slipping and loosening phenomenon, and if so, replacing the thread slipping and loosening phenomenon. The adjustable and controllable prestress hose clamp reinforcing method is used in cooperation with the torque wrench, prestress can be accurately applied, prestress loss caused by later-stage steel loosening can be prevented, the overall deformation capacity and the bearing capacity of the reinforced concrete structure are effectively improved, and development of concrete cracks is restrained.