Variable-gradient operation platform suitable for steel truss girder stiffening string construction

The utility model belongs to the technical field of steel truss girder bridge stiffening string construction, and discloses a variable-gradient operating platform suitable for steel truss girder stiffening string construction, which comprises two cross beams which are arranged oppositely in parallel, and two ends of one cross beam are respectively and fixedly connected with a short vertical support assembly. The two ends of the other cross beam are fixedly connected with long vertical supporting assemblies respectively. The short vertical supporting assemblies and the long vertical supporting assemblies located on the same side are connected through connecting assemblies, the bottoms of the short vertical supporting assemblies and the bottoms of the long vertical supporting assemblies located on the same side are connected with operation platforms, and one ends of the operation platforms are rotationally connected with the corresponding short vertical supporting assemblies. The position, close to the other en