Polymerizer generally consists of a kettle body, a kettle cover, a jacket, a stirrer and a transmission device, seal device, bearing etc.. Because the user due to the production process, operating conditions vary, polymerization reactor agitators are generally anchored, slurry type, turbine type, promote type or frame type. Mixing device in the high diameter is relatively large, can be used as a multi-layer mixing blades, can be arbitrarily selected according to the requirements of users. The jacket is arranged outside the kettle wall, or the heat exchange surface is arranged inside the device, and the heat transfer can be carried out by the outer circulation. Heating method has electric heating, hot water heating, heat conduction oil circulation heating, far infrared heating, outside (inside) coil heating, cooling method for jacket cooling and kettle cooling and so on. Supporting seat has two kinds of suspension or support. Speed over 160 RPM above should be used gear reducer. The number of openings, specifications or other requirements can be designed and produced according to the user's requirements.