A power supply circuit for LED lighting, comprising: an LED power prime circuit ; an LED lighting load electrically connected to output terminals of the LED power prime circuit; a short circuit protection switch module electrically connected between the LED power prime circuit and the LED lighting load, the short circuit protection switch module comprises a load switch configured for turning on or turning off the LED lighting load ; a circuit detecting module electrically connected to the short circuit protection switch module, the circuit detecting module comprising a comparing detecting unit , and a time delay unit , the comparing detecting unit comparing the output voltage of the LED power prime circuit and a predetermined reference voltage and outputting a control signal according to the comparison result, the time delay unit outputting a switch control signal after a delay time for a predetermined time in accordance with the control signal of the comparing detecting unit ; and a controlling switch module configured for turning on or turning off the LED lighting load switch in accordance with the switch control signal outputted by the time delay unit so as to turn on or turn off the power supply for the LED lighting load , characterized in that the time delay unit comprises a delay comparator , a voltage divider resistor group , and an RC charging and discharging circuit , wherein the output terminal of the comparing detecting unit is electrically connected to a non-inverting input end of the delay comparator , an inverting input end of delay comparator is electrically connected to the output terminal of the voltage divider resistor group and wherein the RC charging and discharging circuit comprises a capacitor (C8) electrically connected between the non-inverting input end of the delay comparator and the output terminal of the delay comparator , and a resistor (R12) electrically connected between the output terminal of the comparing detecting unit and ground. an LED power prime circuit ; an LED lighting load electrically connected to output terminals of the LED power prime circuit; a short circuit protection switch module electrically connected between the LED power prime circuit and the LED lighting load, the short circuit protection switch module comprises a load switch configured for turning on or turning off the LED lighting load ; a circuit detecting module electrically connected to the short circuit protection switch module, the circuit detecting module comprising a comparing detecting unit , and a time delay unit , the comparing detecting unit comparing the output voltage of the LED power prime circuit and a predetermined reference voltage and outputting a control signal according to the comparison result, the time delay unit outputting a switch control signal after a delay time for a predetermined time in accordance with the control signal of the comparing detecting unit ; and a controlling switch module configured for turning on or turning off the LED lighting load switch in accordance with the switch control signal outputted by the time delay unit so as to turn on or turn off the power supply for the LED lighting load , characterized in that the time delay unit comprises a delay comparator , a voltage divider resistor group , and an RC charging and discharging circuit , wherein the output terminal of the comparing detecting unit is electrically connected to a non-inverting input end of the delay comparator , an inverting input end of delay comparator is electrically connected to the output terminal of the voltage divider resistor group and wherein the RC charging and discharging circuit comprises a capacitor (C8) electrically connected between the non-inverting input end of the delay comparator and the output terminal of the delay comparator , and a resistor (R12) electrically connected between the output terminal of the comparing detecting unit and ground. <EOS>