The invention discloses an automatic alarm type butterfly valve control device, comprising a valve body, wherein a pneumatic actuator is arranged on the valve body, and the pneumatic actuator drives the valve body; a flow detector is arranged on the valve body, and a flow comparator is arranged on the flow detector; a signal emitting opening is arranged on the flow comparator, and an alarm is further arranged on the flow detector; the alarm is connected with a signal line, and the other end of the signal line is connected with the signal emitting opening. According to the automatic alarm type butterfly valve control device, the flow detector is installed on the valve body; when the fluid flow in the valve body exceeds or is lower than the setting valve, the comparator outputs a driving signal, and the driving signal is transmitted to the alarm through a cable; the alarm sends a warning to remind operators of adjusting the butterfly valve, thereby avoiding exception happening and reducing the user loss.