The purpose of this study is to research the effect of high speed stirring by emulsifier blades on the thermal safety of emulsion matrix. In order to analyze thermal safety of emulsion matrix in emulsifying process, the heating effect influenced by rotor speed and emulsify temperature was combined with self-heat properties of emulsion matrix in this study. Computational fluid dynamics (CFD) is used for analysis. The emulsifier model adopts simplified CYJ type emulsifier, which is a kind of vertical emulsifier and has a large stirring area. The self-heat properties of emulsion matrix are described by Arrhenius equation. The simulation results showed that heat could not accumulate in emulsion matrix due to the strong turbulence formed by stirring. But, because of the shear stress and friction, a high temperature region will be formed around the blades of the rotor in a short time. If the stirring speed reaches 10300 rpm, the temperature in this region would be able to reach the critical ignition temperature of emulsion matrix.