The invention relates to a material water spraying device of a low-temperature multiple-effect distillation seawater desalination evaporator. The material water spraying device comprises a cylinder body and a heat exchange tube bundle arranged in the cylinder body, wherein, the cylinder body is a columnar cylinder body; the heat exchange tube bundle is adaptively arranged along the inner part of the cylinder body; spraying nozzles are arranged above the heat exchange tube bundle; and the space between adjacent spraying nozzles is increased in the tube row number reduction direction of the heat exchange tube bundle. The material water spraying device disclosed by the invention has the advantages that the structure is compact, and the occupied area of can be reduced; and a water distributor of the spraying device disclosed by the invention is optimally arranged according to the structure of the tube bundle, so that the total amount of spraying water is reduced, thereby achieving the effects of reducing the power consumption of a seawater pump and saving heating steam.