The invention discloses a transformer fire behavior restraining method. The method comprises following steps that a temperature detection device detects whether the temperature of a transformer reaches the first threshold value; a control device controls an oil discharging device to drain oil in the transformer; and meanwhile, the invention further provides a transformer fire behavior restrainingsystem. The system comprises the temperature detection device, the control device and the oil discharging device. The temperature detection device is used for detecting the transformer temperature, the control device is used for receiving a temperature detection signal of the temperature detection device, and controlling the oil discharging device to discharge oil on the basis of the temperature detection signal, the oil discharging device is used for discharging oil in the transformer when the temperature of the transformer reaches the first threshold value; and the method and system have thebeneficial effects that the oil in the transformer can be drained, the fire behavior can be further prevented from being increased, and the explosion caused by continuous temperature rise of a transformer can be prevented.