The invention discloses a method and device for monitoring the performances of a controller, and the method comprises the steps: detecting whether the transmission time delay of the controller in transmitting a data packet to a switcher is within a preset time delay range or not; and controlling the performances of the controller to be in an abnormal state if the transmission time delay is not within the preset time delay range. According to the invention, the transmission time delay of the controller in transmitting the data packet to the switcher is detected, and then is compared with the preset time delay range. If the transmission time delay is within the preset time delay range, it indicates that the performances of the controller are normal; if the transmission time delay is not within the preset time delay range, it indicates that the performances of the controller are abnormal. The method achieves the monitoring of the performances of the controller through the transmission time delay of the data packet, achieves the effective monitoring of the performances of the controller, can achieve the reasonable use of the system resources according to the condition of the performances, and solves the problem that the utilization rate of the system resources is lower in the prior art because the performances of a controller cannot be monitored.