In the title salt, C(20)H(20)N(6) (2+)·2ClO(4) (-), the cation is disposed about a center of symmetry at the mid-point of the N=N bond. The 1,8-naphthyridine systems are planar and the ten atoms have a mean deviation of 0.01 Å from the least-squares plane. The two planar 1,8-naphthyridine units are parallel but extend in opposite directions from the diazene bridge. The 1,8-naphthyridine aminium groups inter-act with perchlorate O atoms through N-H⋯O hydrogen bonds.