Steel structure bearing truss girder and using method thereof

The invention relates to a steel structure bearing truss girder and a using method thereof.The steel structure bearing truss girder comprises a first transverse column, a supporting device is arranged at the bottom of the first transverse column, a second transverse column is arranged at the bottom of the supporting device, the supporting device comprises four fixing blocks, the fixing blocks are arranged at the two ends of the bottom of the first transverse column and the two ends of the top of the second transverse column, and a telescopic plate is arranged in the middle of the bottom of the first transverse column; the outer surface of the bottom of the telescopic plate is sleeved with a telescopic block, a transmission block is arranged at the bottom of the telescopic block, a threaded rod is rotationally matched with the interior of the transmission block, and threaded blocks are in threaded fit with the surfaces of the two ends of the threaded rod. Through the mutual cooperation effect of a fixed block,