The invention relates to a water-soluble
ammonium phosphate fertilizer wrapping agent and a preparation method thereof. The water-soluble
ammonium phosphate fertilizer wrapping agent comprises the following components in parts by weight: 10-20 parts of plasticized modified
polyvinyl alcohol, 10-30 parts of crosslinked
starch and 50-80 parts of water, the plasticized modified
polyvinyl alcohol is obtained by thermally fusing a
plasticizer and
polyvinyl alcohol, the crosslinked
starch is obtained by carrying out crosslinking reaction on a crosslinking agent and
starch under the action of a catalyst, and the plasticized modified polyvinyl
alcohol, the crosslinked starch and water are uniformly stirred and mixed to prepare the water-soluble
ammonium phosphate fertilizer wrapping agent. The water-soluble wrapping agent is used for wrapping the
ammonium phosphate fertilizer, so that the fertilizer is consistent in color inside and outside, free of
color difference, high in wrapping capacity, light-proof, sun-proof, temperature-resistant, free of color
fading and free of color change, meanwhile, the method is low in use cost and good in anti-
caking performance, the fertilizer is coated with the water-soluble wrapping agent, the fertilizer loosening rate reaches 90% or above, the water-soluble wrapping agent can be rapidly biodegraded, and
environmental protection is facilitated.