The invention provides an LED drive circuit comprising a first rectification and filtering circuit which performs rectification and filtering on input AC voltage so as to output first voltage; a DC-AC conversion circuit based on pulse width modulation which performs DC-AC conversion on first voltage based on a pulse width modulation signal so as to output second voltage; a second rectification and filtering circuit which performs rectification and filtering on second voltage so as to output third voltage to an LED load; a current detection circuit which respectively detects current of at least one LED string and outputs at least one feedback voltage which reflects current of each LED string in the LED load; a feedback circuit which generates and outputs a signal related to at least one feedback voltage and third voltage based on at least one feedback voltage and third voltage; and a pulse width modulation controller which generates the pulse width modulation signal according to the signal outputted by the feedback circuit. According to the LED drive circuit, the number of elements can be reduced.