A voltage control circuit is provided. The voltage control circuit comprises a control voltage source, a current generating unit, and an output voltage generating unit. The control voltage source inputs a single end control voltage. The current generating unit coupled to the control voltage source and a ground generates a first current according to the single end control voltage. The output voltage generating unit coupled to the current generating unit, receives a reference voltage, and generates a first output voltage and a second output voltage according to the first current and the reference voltage. A value of the first output voltage is greater than a value of the second output voltage.