Preparation method of water-based nitrocellulose emulsion and nitrocellulose film

The invention relates to a preparation method of a water-based nitrocellulose emulsion and a nitrocellulose film. The preparation method comprises the following steps: adding 2-hydroxyethyl acrylate, acrylic acid, butanone and azodiisobutyronitrile into a reactor, and carrying out free-radical polymerization reaction at 50-90 DEG C for 2-3 hours; after the reaction finishes, adding dibutyltin dilaurate and isophorone diisocyanate in a nitrogen protective atmosphere, carrying out thermostatic reaction at 25-65 DEG C for 1-2 hours, heating to 70-95 DEG C, adding a nitrocellulose butanone solution, and keeping the temperature to react for 2-3 hours; and cooling, regulating the pH value of the obtained reaction system to 8-9, adding deionized water, and dispersing uniformly to obtain the water-based nitrocellulose emulsion. The water-based nitrocellulose emulsion prepared by the preparation method is subjected to running film formation to obtain the nitrocellulose film. The water-based nitrocellulose emulsion has the advantages of favorable water dispersibility, favorable storage stability, high film flexibility, high adhesive force, high water resistance and high yellowing resistance.