A novel energetic ionic salt 1-amino-2-nitroguanidinium 4-nitroamino-1, 2, 4-triazole salt was synthesized using 1-amino-2-nitroguanidine and 4-nitroamino-1, 2, 4-triazole as the starting materials, and its reaction conditions were optimized.Its thermal decomposition behavior was investigated by TG-DSC.Its detonation properties were predicted using Kamlet-Jacobs formula.Results show that the yield of 1-amino-2-nitroguanidinium 4-nitroamino-1, 2, 4-triazole salt is up to 86.5% under the optimum synthetic conditions of reaction time 4 h and reaction temperature 50 ℃.The compound decomposes sharply around 175.5 ℃, revealing a better thermal stability.The heat of formation of the compound obtained by Born-Haber cycle is 551.3 kJ·mol^-1.The determined value of density is 1.59 g·cm^-3.Based on the heat of formation and density obtained, the detonation velocity and detonation pressure of the compound are 8.05 km·s^-1 and 26.6 GPa, respectively.