The invention provides a liquid crystal display device, an LED backlight circuit and an LED lamp bar power supply circuit. The LED lamp bar power supply circuit comprises an LED lamp bar, a first ground resistor and a second ground resistor which are connected in series with the LED lamp bar, and a first detection resistor and a second detection resistor, wherein the connection portion of the first ground resistor and the second ground resistor is in ground connection, the first ground resistor and the second ground resistor are connected in series to form a first series circuit, the first detection resistor and the second detection resistor are connected in series to form a second series circuit, and the second series circuit and the first series circuit are connected in parallel. The LEDlamp bar power supply circuit is advantaged in that the function of reflecting the ground half short circuit of the LED lamp bar is realized.