The invention relates to a large-span steel-timber-cable hybrid-structure system. The large-span steel-timber-cable hybrid-structure system is characterized in that the top of the system is of a silo-shell structure, the middle area in the extending direction of the silo-shell structure is a timber reticulated shell (1), the two sides of the timber reticulated shell (1) are connected with steel reticulated shells (2), the bending moment of the timber reticulated shell (1) is smaller than the bending moment of the steel reticulated shells (2), and an intersecting-cable-net supporting structure (3) is arranged at the bottom of the timber reticulated shell (1). According to the large-span steel-timber-cable hybrid-structure system, compared with the prior art, the aesthetic requirements for an modern public building are met, structural internal force distribution is considered, and the positions with large bending moments adopt steel structures, so that the bending resistance is guaranteed; and the intersecting-cable-net supporting structure is arranged at the bottom of the timber reticulated shell, so that the safety degree of whole structure is enhanced, and through applying prestress on pull cables, the vertical rigidity of a timber structure can be enhanced.