The preparation method comprises: dissolving insulin in a 0.01mol/L hydrochloric acid solution first, adding silicon dioxide aerogel, drying for following use after complete adsorption; then, dissolving PEG in absolute ethyl alcohol, adding the dried solid and delivering into an emulsifying machine for emulsification, drying the emulsified liquid in a constant-temperature drying box, grinding and sieving by using a 200-mesh sieve.
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