The invention provides a
phosphate fertilizer synergist, a preparation method of the
phosphate fertilizer synergist, a
phosphate fertilizer synergist
powder and a
phosphate fertilizer. The
phosphate fertilizer synergist is prepared from wood vinegar,
organic acid and / or
organic acid salt and water, wherein the content of wood vinegar is 5-95%, preferably, 15-85%, more preferably, 25-75%, and the most preferably, 35-65%; the content of
organic acid and / or organic
acid salt is 0.5-50%, preferably, 5-45%, more preferably, 10-40%, and the most preferably, 10-30%; the content of water is 0-94.5%, preferably, 0-80%, more preferably, 0-65%, and the most preferably, 5-55%. The
phosphate fertilizer synergist can be applied to soil directly and can also be applied after being mixed with the phosphate fertilizer, so that immobile phosphorous in the soil and the phosphate fertilizer is activated, and poorly-soluble
inorganic phosphorus compounds are absorbed and utilized by crops. Besides, all components of the phosphate fertilizer synergist are selected from natural products, and thus the phosphate fertilizer synergist is friendly to the soil environment and can increase the
utilization rate of the phosphate fertilizer.