Backlight LED driving circuit

The invention discloses a backlight LED driving circuit. The backlight LED driving circuit comprises a power supply input end which is used for providing power supply voltage. The backlight LED driving circuit is characterized by further comprising a PWM waveform output circuit, a boost circuit and a diode alternative circuit, wherein an input end of the boost circuit is connected to the power input end, and an output end of the boost circuit is connected to a first input end of the diode alternative circuit; a second input end of the diode alternative circuit is connected to the power input end; an output end of the diode alternative circuit is connected to positive end driving of a backlight LED, and an output end of the PWM waveform output circuit is connected to negative end driving of the backlight LED. The backlight LED driving circuit overcomes a problem of low efficiency, which is caused by instability of a power supply system, of an LED backlight in the prior art, and provides an efficient and low-power-consumption circuit for driving the backlight LED.