A mobile steel-structure overpass for the crossroad traffic is disclosed. Piers (1) and assistant piers (14) are both formed by welding steel plates. Main bridge arches (2) and assistant bridge arches (3) are made of seamless steel tubes. The main bridge arches are connected with the piers and the assistant bridge arches by flanges (4), and a bridge abutment (13) is connected with the assistant piers and the assistant arches by flanges. The bridge floor (5) is coated with a rubber layer (15). Three floors are provided between the bridge arches and assistant bridge arches of the overpass. From bottom to top, the first floor is a longitudinal left-turning roadway and a transverse sidewalk, the second floor is a transverse left-turning roadway and a longitudinal sidewalk, and the third floor is a longitudinal roadway. The overpass has the advantages of using steel structure, on-site installation, increasing the construction efficiency, avoiding the construction and demolition of the road peripheral facilities, and contributing to protect the overall layout of the city. The left-turning of the crossroad is realized by the left-turning on the one-way road, thus vehicle can pass without traffic lights, and the trafficability of the road can be improved significantly.
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