A LED backlight driving circuit is disclosed. The LED backlight driving circuit includes a boost circuit for converting an input voltage to an output voltage for a LED unit, a driving IC for controlling the boost circuit such that the boost circuit converts the input voltage to the output voltage for the LED unit, a discharging module for releasing charges stored within the boost circuit after the driving circuit is turned off, and a detecting module for detecting a voltage at an output end of the boost circuit and then for generating enable signals for controlling the operations of the driving IC. The LED backlight driving circuit is capable of detecting a discharging state of the boost circuit after being quickly rebooted. The driving circuit can be rebooted only if the output voltage is smaller than a reference voltage as the charges stored within the boost circuit is released. As such, the flashing issue is avoided. In addition, the liquid crystal device including the above LED backlight driving circuit is also disclosed.