The invention disclsoes a novel trinitromethylazoles energetic compound and a preparation method thereof. The trinitromethylazoles energetic compound is trinitromethyl-1,2,4-triazole amphoteric ion diazonium salt; the preparation method of the trinitromethylazoles energetic compound comprises the following steps: adding 5-amino-1,2,4-triazole-3-carboxylic acid and bi(5-nitramine-1,2,4-triazole)ethane hydrochloride into fuming nitric acid according to a certain ratio under a low-temperature bath at -15 DEG C, and sufficiently dissolving; after sufficiently dissolving, dropwise adding concentrated sulfuric acid at low temperature; after dropwise adding and reacting for a period of time, raising to normal temperature and continually reacting for one night; pouring a reacting solution into crushed ice and quenching; filtering, and extracting filtrate through dichloromethane; after drying an organic phase through anhydrous magnesium sulfate, spinning and drying at room temperature to obtain the trinitromethyl-1,2,4-triazole amphoteric ion diazonium salt. The trinitromethyl-1,2,4-triazole amphoteric ion diazonium salt prepared by the method is a high-energy-density energetic material with a good application prospect; the preparation method provided by the invention is easy to control and has moderate reaction conditions, and a product is easy to separate.