Cable-stayed support and supporting truss

The utility model provides a cable-stayed support and a supporting truss, and belongs to the technical field of truss structures, the cable-stayed support comprises a cross beam, a diagonal bracing assembly and a cable-stayed assembly, the diagonal bracing assembly is provided with two upward diagonal bracing pieces inclining towards opposite directions, the upper ends of the two diagonal bracing pieces are respectively connected with the cross beam, and the lower ends of the two diagonal bracing pieces are respectively connected with the cable-stayed assembly. The lower ends of the two inclined supporting pieces are suitable for being arranged on the same foundation. The cable-stayed assembly is provided with two cable-stayed parts which are downward and incline in opposite directions, the lower ends of the two cable-stayed parts are connected with the cross beam, the upper ends of the two cable-stayed parts are connected to the supporting part, and the lower end of the supporting part is supported on the cr