The invention discloses an energetic compound 1,3,5-three(1H-1,2,4-triazolyl)-2,4,6-trinitrobenzene and a synthetic method thereof. The synthetic method comprises the following steps: dissolving 1,3,5-trichloro-2,4,6-trinitrobenzene in a reaction medium, adding 1H-1,2,4-triazole, then adding a catalyst at a constant temperature, carrying out a reaction until no material point is detected by thin-layer chromatography, filtering the solid-liquid mixture under reduced pressure, steaming off the reaction medium in the filtrate by a rotary evaporator, then separating and purifying by a column chromatography method, and carrying out vacuum drying to obtain the target product 1,3,5-three(1H-1,2,4-triazolyl)-2,4,6-trinitrobenzene. The new compound is the novel energetic material having good potential application prospects. The synthetic method adopts 1,3,5-trichloro-2,4,6-trinitrobenzene and 1H-1,2,4-triazole as the raw materials, synthesizes the target product through the coupling reaction, has mild reaction conditions in the synthetic steps and simple reaction steps, and is suitable for mass production.