The utility model relates to a waterborne acrylic acid synthesis temperature control system, the technical scheme who adopts is: including being used for going on the reation kettle that reacts, the last cooling water that is provided with of reation kettle adds the pipeline, still includes control module, is provided with temperature sensor in the reation kettle, and the cooling water is provided with adjusting valve on adding the pipeline, and temperature sensor and adjusting valve connect control module respectively, and control module controls adjusting valve's aperture according to the temperature value of temperature sensor feedback, control module can adopt PLC, singlechip and computer. Temperature sensor conveys control module with temperature signal, gives adjusting valve in control module completion contrast and output signal, and the change of adjusting valve aperture arouses cooling water flow's change to realize the automatic control of temperature. More traditional manual operation compares, the utility model discloses adjust the more accurate energy saving that more saves and consume, and it is safer not have personnel field operation.