Large-span truss structure

The invention discloses a large-span truss structure which comprises a main body, a bracket and a truss, the bracket is installed on the main body to form a support, the truss is connected with the bracket through a limiting assembly, and the limiting assembly at least comprises an upper limiting assembly connected to the top of the bracket and a lower limiting assembly connected to the bottom of the bracket. The upper limiting assembly at least comprises a semi-cylinder shaft used for supporting a bracket and a truss and an upper connecting piece used for connecting the bracket and the truss, and the lower limiting assembly at least comprises a connecting bridge used for connecting the bracket and the truss and a lower connecting piece used for fixing the connecting bridge and can bear the vertical and horizontal load capacity of the truss. And after being installed in place, the anti-sliding and anti-falling structure conforms to mechanical assumption, can resist accidental loads, is convenient to install i