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In this work, interfacial reaction kinetics between α-[3-(2,3-epoxypropoxy)­propyl]-ω-butyl-polydimethylsiloxane emulsion droplets with different sizes and gelatin was studied. The results of amino conversion rate determination show that the reaction proceeded in two steps. Fluorescence spectra analysis indicates that step 1 (0–2 h) should be the adsorption of gelatin on droplet surface. In step 2 (2–13 h), amino conversion rate increased rapidly. The reaction rate in step 2 (k 2) was obtained by using the 2nd-order approach to model the grafting reaction kinetics. The quantitative relationships among amino conversion rate, droplet size, the concentration of surfactant, reaction temperature, and time were described by linear regression models in given ranges of conditions in step 2. Thermodynamic analysis indicates that the interfacial reaction is an endothermic reaction. After 13 h, the reaction was almost stopped.