Long-span truss structure

The utility model relates to a long-span truss structure which comprises a longitudinal main truss, a transverse main truss and a circular truss. The two ends of the longitudinal main truss are connected with the two ends of the transverse main truss respectively; the circular truss is arranged in the middle of a rectangular structure formed by the longitudinal main truss and the transverse main truss, the circular truss comprises an upper chord member and a lower chord member, the upper chord member and the lower chord member of the circular truss are parallel and are connected through multiple vertical web members, the circular truss and the longitudinal main truss are connected through a first transverse secondary truss, and the circular truss and the transverse main truss are connected through a first longitudinal secondary truss. The long-span truss structure has the advantages that space structure arrangement is optimized by means of the main trusses and the secondary trusses, manufacturing cost of the