An embodiment of the invention discloses a backlight module driving circuit and a display device, and relates to the field of circuits. The backlight module driving circuit comprises a judging module and a restarting module; the judging module transmits abnormal signals to the restarting module when judging that changing power signals reach a preset value; the restarting module transmits restarting signals when receiving the abnormal signals from the judging module, so that the backlight module driving circuit is restarted. The backlight module driving circuit and the display device have the advantage that normal operation of the backlight module driving circuit can be guaranteed when levels of the power signals are excessively low or durations of the low levels of the power signals are excessively long.