Combined sound barrier

The utility model discloses a combined sound barrier which comprises a plurality of fixing mechanisms, a plurality of barrier unit plates and a plurality of outer decorative plates. Each fixing mechanism comprises a stand column, a pressing plate and a distance adjusting assembly. The two sides of the barrier unit plates are clamped between the pressing plates and the stand columns of the two adjacent fixing mechanisms respectively; each outer decorative plate is fixed between every two adjacent stand columns, and a cavity area is formed between each outer decorative plate and the corresponding barrier unit plate. The device has the advantages that the distance between the stand column and the pressing plate is adjusted through the distance adjusting assembly, so that barrier unit plates of different thicknesses can be clamped, the requirements of the barrier unit plates of different thicknesses can be met only by preparing the stand column of one specification, the production cost is reduced, and meanwhile d