Deviation rectifying frame with good stability and mounting method

The invention provides a deviation rectifying frame with good stability and an installation method. The deviation rectifying frame comprises a welding upper frame. The number of the sliding rail assemblies is two, and the two sliding rail assemblies are symmetrically arranged at the lower end of the welding upper frame. And the supporting assembly is arranged at the lower end of the welding upper frame, the supporting assembly is arranged between the sliding rail assemblies, and the supporting assembly coincides with the center line of the welding upper line and is used for supporting the welding upper frame, so that the stability of the welding upper frame is guaranteed. The supporting assembly is arranged between the sliding rail assemblies, a fulcrum is provided for the welding upper frame, force borne by the sliding rail assemblies on the two sides of the welding upper frame is reduced, the stability of the welding upper frame in the deviation rectifying process is guaranteed, and normal deviation rectify