Polynitrostilbene compound as well as preparation method and application thereof

The invention discloses a polynitrostilbene compound, a preparation method and application thereof. The preparation method comprises the following steps: mixing concentrated nitric acid and concentrated sulfuric acid into a reaction solution, slowly adding 1, 3, 5-trimethylbenzene at 0 DEG C, heating to room temperature after dropwise adding, and reacting to obtain a first mixed solution; pouring the first mixed solution into an ice-water mixed solution to generate a white solid, and filtering, washing and drying to obtain a first product; the first product and p-nitrobenzaldehyde are mixed and dissolved in an organic solvent, a basic catalyst and a carrier are added, and a solid mixture loaded with raw materials is obtained; transferring the solid mixture into a microwave reactor to obtain a second product; and after the reaction is finished, extracting the second product with acetone, removing acetone to obtain a crude product, and recrystallizing the crude product to obtain a target product. The melting po