Chitosan biological liquid-state foliar nutrition protective film and preparation method thereof

The invention discloses a chitosan biological liquid-state foliar nutrition protective film and a preparation method thereof. The method comprises the following steps: adding 80-150 parts by weight ofpurified water and 1-4 parts by weight of a glacial acetic acid solution to a reaction tank, wherein the reaction tank is a reaction tank provided with a heating device and a stirring device; starting the heating device and the stirring device, after warming the reaction tank to 40-60 DEG C, putting 2-5 parts by weight of chitosan into the reaction tank. The foliar nutrition protective film takesthe natural pollution-free chitosan as a film forming body and cooperates with substances of gelatin or glycerinum and the like, so as to have a good film-forming property, wherein the formed protective film can be used as a carrier of a nutrient element, a bacteriocidal substance and an insecticide substance, can uniformly wrap the exterior of a leaf to form the protective film, effectively improve disease resistance of