The utility model provides a MMA production is with cooling device who mixes reaction system, is equipped with the heat exchanger, is equipped with water inlet and delivery port on the heat exchanger, is equipped with the circulating water temperature adjusting mechanism who adjusts the difference in temperature between water inlet and delivery port between water inlet of the heat exchanger and the delivery port, is equipped with control of recirculating water temperature adjusting mechanism's control mechanism in water inlet and delivery port department, circulating water temperature adjusting mechanism is equipped with the circulating pipe way, the outlet pipe way that the circulating pipe way includes the water intake pipe that meets with the water inlet, meet with the delivery port and the intercommunication pipeline on intercommunication business turn over water pipe way are equipped with the steam generator who improves temperature among the water intake pipe on the water intake pipe between intercommunication pipeline and the heat exchanger. The utility model discloses a circulating water temperature adjusting mechanism reduces the difference in temperature between water inlet of the heat exchanger and delivery port, makes the control of heat exchanger exit temperature below the scale deposit temperature to realize the long period steady operation of heat exchanger, realize heat exchange efficiency's optimal control, improve cooling efficiency.