Disclosed is a spraying nozzle capable of reducing the salt in alkali which comprises nozzles and a spraying head. The spraying nozzle is characterized in that the nozzle is of hopper shape and is arranged on the spraying head, nozzles which are arrayed in row are arranged on a water pipe above an alkali filter, the space between the rows is 100 to 500 mm, and the space between a nozzle and a nozzle is 20 to 200 mm. The utility model can make sure that the water be sprayed evenly, the same amount of alkali can be controlled and 35% of water can be saved. When a spraying is in use, the salt in alkali is between 0.15 % to 0.4%, when the utility model is in use, the salt in alkali can be reduced to 0.05% to 0.15%, thereby increasing ingredient of mother water and increasing the quality of product, with the spraying nozzle instead of the spraying groove, the salt in alkali can not only be controlled easily but also be stable. The utility model is an ideal cleaning device for chemical engineering crystalline solid.