LED power failure processing method and circuit and LED lighting device

The invention relates to an LED power failure processing method and circuit and an LED lighting device. The LED power failure processing method comprises the steps that based on the power supply voltage VCC of a controller, after the controller enters an under-voltage locking state, a feedback circuit is controlled to generate strong pull-down current Isd, the strong pull-down current Isd is applied to the power supply voltage VCC end of the controller, the sum of the strong pull-down current Isd and the working current when the controller enters the under-voltage locking state is larger than the power supply current provided by a peripheral power supply, and when the controller enters the under-voltage locking state, the strong pull-down current Isd is applied to the power supply voltage VCC end a voltage stabilizing capacitor corresponding to the power supply voltage VCC discharges, so that the input voltage VCC is reduced; when the power supply voltage VCC drops to a strong pull-down closing threshold volt