The invention discloses a safety dynamic drive circuit which comprises a first controller, a second controller, a first transformer, a first driver, a second transformer, a second driver, a first rectifier module, a second rectifier module, a high-frequency pulse module, a drive coupling module, a third transformer, a third driver and a third rectifier module. The first driver is used for controlling the first transformer according to a first low-frequency dynamic square wave signal, the second driver is used for controlling the second transformer according to a second low-frequency dynamic square wave signal, the drive coupling module is connected with the first rectifier module and the high-frequency pulse module, the third driver is used for controlling the third transformer according to a forward bias pulse signal, and the third rectifier module is used for rectifying a secondary signal of the third transformer. According to the safety dynamic drive circuit, energy transmission efficiency can be improved, and the size of the transformer can be reduced.