The invention relates to the field of glass production machinery, in particular to a transmission control mechanism of a stirring system. The transmission control mechanism is characterized in that: the signal input end of a programmable logic controller (PLC) controlled by a computer is connected with the signal input end of a variable frequency speed regulator set, the signal input end of the variable frequency speed regulator set is connected with the signal input end of a motor, the signal output end of the motor is connected with the signal input end of a clutch, the signal output end ofthe clutch is connected with the signal input end of a trigger, the signal output end of the trigger is connected with the signal input end of a proximity sensor, and the signal output end of the proximity sensor is connected with the other signal input end of the PLC. The transmission control mechanism has the advantages that: 1, the proximity sensor is matched with the trigger rather than a cheaper coder to monitor the rotational speed and the steering of a stirring blade in real time; 2, the trigger is arranged in the same plane as the stirring blade to simply monitor the phase angle of the stirring blade; and 3, by adopting the PLC for measurement, display and control operation, the transmission control mechanism has high reliability and strong adaptability.