In the title salt, C(19)H(20)N(6) (2+)·2ClO(4) (-), the two planar 1,8-naphthyridine systems are linked by a methyl-enediamine group with a dihedral angle of 60.6 (1)° between the two systems. The crystal structure involves extensive N-H⋯O and C-H⋯O hydrogen bonding.