The invention relates to a method for preparing iodo aromatic hydrocarbon. According to the invention, an aromatic-ring-containing compound, I2, a catalyst NO2, and an organic solvent are added into a reaction vessel, wherein a substance amount ratio of the aromatic-ring-containing compound to I2 to the catalyst NO2 is 1:0.2-3:0.01-5; the reaction vessel is sealed; the mixture is subjected to a reaction for 5min-40h under stirring and under a temperature of 10-180 DEG C; after the reaction, the product is cooled to room temperature; the mixture after the reaction is purified through column chromatography, such that iodo aromatic hydrocarbon is obtained. According to the iodo aromatic hydrocarbon preparation method, the adopted raw materials and reagents have the advantages of simple components and low cost, such that production cost is substantially reduced. Acid is not used, a low-boiling-point solvent is selected, the product is easy to separate and purify, the product has high purity, and the process is simple.