The utility model provides a safety control device used for a leaf vertical dividing and cutting machine. The safety control device comprises a dividing and cutting knife, a dividing and cutting knife elevating shaft and an elevating motor controlling elevating of the dividing and cutting knife. The safety control device also comprises a brake device which locks the dividing and cutting knife elevating shaft under the disconnection state, a relay which is connected with the brake device and controls starting or relieving of the locking state of the brake device, a frequency converter which is connected with the elevating motor and controls operation speed of the motor, and a PLC controller of which the two ends are respectively connected with the relay and the frequency converter so as to control the relay and the frequency converter to work cooperatively. Safety of equipment operation can be effectively guaranteed by the device so that the threat to personal safety of maintenance personnel caused by sudden falling of the dividing and cutting knife can be avoided, damage to equipment hardware can also be effectively avoided, the service life of equipment can be prolonged and production cost of enterprises can be reduced.