Assembly machine suitable for narrow and small space of subway underground lines and overhead line cross-line track panels

The utility model relates to the technical field of engineering technology construction, in particular to a cross-line track panel assembling machine suitable for narrow space and overhead lines of subway underground lines and a construction method of the cross-line track panel assembling machine, which comprises a main beam and landing legs, and is characterized in that the main beam and the landing legs are assembled in a modular manner, and the main beam comprises a main beam structure and a main beam connecting beam; the main beam structure is horizontally and transversely arranged on theupper portion of the track layer overall structure, the front ends and the rear ends of the left side and the right side are connected through main beam connecting beams respectively, and the lower portions of the left-side rear end and the right-side rear end of the main beam structure are connected with supporting legs. Each supporting leg comprises a left assembly and a right assembly, and eachassembly comprises two su