The present invention provides an LED light bar and a backlight module of liquid crystal display device. The LED light bar of liquid crystal display device includes: a metal core printed circuit board and an LED chip mounted on the metal core printed circuit board. The metal core printed circuit board includes a metal substrate, an insulation layer formed on the metal substrate, and a circuit formed on the insulation layer. The LED chip has leads to electrically connect with the circuit. The insulation layer forms a hollow portion corresponding to the LED chip. The LED chip is received in the hollow portion and the LED chip has an undersurface engaging the metal substrate. The present invention has a simple structure, is easy to manufacture, and makes an LED light bar showing improved heat dissipation performance.