The invention provides a voltage output system and LCD device. The voltage output system is disposed with a variable resistor, one end of the variable resistor is connected to the input voltage transmitted by the level-shifting unit through a contact and a wire, and the other end of the variable resistor is electrically connected to the LCD panel to output an output voltage through a contact and a wire. After the voltage output system is disposed on the assembled circuit board of the LCD device, when the LCD device is tested, the output voltage of the voltage output system can be preset by adjusting the resistance of the variable resistor so that the required different voltages can be provided to the LCD panel conveniently and quickly, which simplifies the test of the LCD device and reduces the product cost.