The utility model discloses a reaction kettle used for polyester resin production. The reaction kettle comprises a kettle body. Cavities are arranged on the positions of the inner wall and the outer wall of the kettle body and used for circulation of heat conduction fluid. Due to the fact that the cavities are arranged inside and outside the kettle body and used for the circulation of the heat conduction fluid, a rise-temperature or fall-temperature process can be rapidly achieved in the process of polyester resin production, and thus normal production of polyester resin is guaranteed.