The invention relates to a rectifying method using dynamic monitoring and dynamic reinforcement. The rectifying method comprises the following steps: S1, measurement is conducted, specifically, the settlement amount of steel columns is monitored, the steel columns needing to be rectified are determined and recorded as rectifying columns, and the remaining steel columns are recorded as in-situ columns; S2, column bracing is conducted, specifically, horizontal extension beams are mounted on the steel columns on the same side of a steel structure, the extension beams are fixedly connected with the in-situ columns, the extension beams limit horizontal displacement of the rectifying columns, and the rectifying columns can move in the vertical direction; S3, equipment mounting is conducted, specifically, force transmission frames are fixed to the bottoms of the rectifying columns, jacking appliances are mounted between the force transmission frames and bearing platforms, and the two or morejacking appliances are arranged; and S4, settlement rectifying of the rectifying columns is conducted, specifically, connecting steel plates at the bottoms of the rectifying columns and the bearing platforms are disconnected, the lifting appliances are started to drive the rectifying columns to move upwards until the rectifying columns reach the designed height. The force transmission frames are jacked to drive the rectifying columns to move upwards, so that a foundation pit with the large depth does not need to be excavated in the rectifying process, and the construction efficiency can be improved.