Compared with traditional superphosphate and granulated compound fertilizer, water-soluble fertilizer has obvious advantages. It is a kind of quick acting fertilizer with good water solubility and no residue. It can be completely dissolved in water and can be directly absorbed and utilized by the roots and leaves of crops. The effective absorption rate is more than twice as high as that of ordinary chemical fertilizer, reaching 80% - 90%; Moreover, the fertilizer efficiency is fast, which can meet the nutritional needs of high-yield crops in the rapid growth period. The water requirement of the drip irrigation system is only 30% of that of the ordinary chemical fertilizer, and the fertilization operation can be almost without manual labor, which greatly saves the labor cost. More and more experts of soil and fertilizer, experts of agricultural technology extension, dealers of agricultural materials and farmers have realized the importance of water-soluble fertilizer.