Polymerization reaction device

The utility model provides a polymerization reaction device which comprises a reaction kettle provided with an additive feeding hole, a first gas inlet and a first gas outlet; the propylene storage tank is used for storing liquid propylene; the alpha-olefin storage tank is used for storing liquid alpha-olefin; the gas mixing mechanism is provided with a material inlet and a second gas outlet, the propylene storage tank and the alpha-olefin storage tank are respectively communicated with the material inlet of the gas mixing mechanism so as to respectively introduce propylene and alpha-olefin into the gas mixing mechanism, and the gas mixing mechanism can heat the materials so as to mix and gasify the materials; the second gas outlet of the gas mixing mechanism is communicated with the first gas inlet of the reaction kettle. By means of the technical scheme, the problem that in the prior art, liquid comonomers are added into a reaction kettle at a time, and the product uniformity is poor due to the fact that th