The invention discloses a large-scale stiffening-ring-spliced type triangular truss, and relates to the technical field of composite material structures. The triangular truss comprises a circular ringtriangular truss assembly, a radial pull rod assembly and a hub shaft assembly, and the circular ring triangular truss assembly and the hub shaft assembly are connected through the radial pull rod assembly, wherein the circular ring triangular truss assembly is formed by sequentially splicing a plurality of segment modules, and triangular connecting plates are arranged at two ends of the segmentmodules; the radial pull rod assembly comprises a rod body, hinged heads and fine adjustment joints, wherein the hinged heads and the fine adjustment joints are arranged at both ends of the rod body;and the hub shaft assembly comprises a hub shaft main body tube, a shuttle-shaped joint, an end mandrel, a hub connecting ring and a pressure-bearing ejecting-pushing sleeve, wherein the shuttle-shaped joint, the end mandrel, the hub connecting ring and the pressure-bearing ejecting-pushing sleeve are connected sequentially with the two ends of the hub shaft main body tube, the hub connecting ringis connected with the fine adjustment joint and connected with the triangular connecting plates of the segment modules through the radial pull rod assembly. The large-scale stiffening-ring-spliced type triangular truss can realize a large-scale composite material structure, stiffening rings can improve the overall rigidity of the truss, the load-bearing deformation ability and stability performance of the truss are improved, and the large-scale stiffening-ring-spliced type triangular truss can be applied to large-scale aircraft structures such as airships, unmanned aerial vehicles and the like and aerospace assembled type platforms.