Steel truss girder bridge floor and steel truss girder bridge

The embodiment of the invention provides a steel truss girder bridge floor and a steel truss girder bridge, the bridge floor comprises a main truss, a bridge deck slab and a cross beam, the bridge deck slab is connected with a lower chord member of the main truss, the top surface of the bridge deck slab is not higher than the top surface of the lower chord member of the main truss, and the middle part of the bridge deck slab is sunken downwards to form a passage surface; a plurality of cross beams which are arranged in parallel are arranged on the bottom surface of the bridge deck slab, the length direction of the cross beams is perpendicular to the length direction of the bridge deck slab, the cross beams are connected with main truss lower chord members, and the bottom surfaces of the cross beams are not lower than the bottom surfaces of the main truss lower chord members. On the premise of not changing the size of the main truss rod piece of the steel truss girder bridge, the bridge building height of the