The invention relates to 3, 6-dinitramine [1, 2, 4] triazolo [4, 3-b] [1, 2, 4] triazole as well as an ionic salt, a preparation method and application thereof, wherein the 3, 6-dinitramine [1, 2, 4] triazolo [4, 3-b] [1, 2, 4] triazole has a better application prospect in high-energy explosives. According to the molecular sturcutre of 3, 6-dinitramine [1, 2, 4] triazolo [4, 3-b] [1, 2, 4] triazole, a nitramine group perpendicular to the N5 position of a fused ring skeleton is removed from the molecular structure of 3, 6-dinitramine [1, 2, 4] triazolo [4, 3-b] [1, 2, 4] triazole, so that when the 3, 6-dinitramine [1, 2, 4] triazolo [4, 3-b] [1, 2, 4] triazole is converted into anions, a completely planar large conjugated system is formed, the pi-pi interaction between layers is enhanced, and the thermal stability and sensitivity of the dinitramine triazolo triazole energetic ionic salt are improved. According to the invention, the energetic ion salt is tested by a BAM impact sensitivity instrument, and the impact sensitivity is 7-10 J; a BAM friction sensitivity instrument is used for testing to find that the friction sensitivity is 140-220 N. In combination with detonation performance and sensitivity, the detonation performance of the hydrazinium salt is equivalent to that of RDX, the sensitivity is superior to that of RDX, and the comprehensive performance is optimal.