The invention provides a full common gate common source reference voltage source. The full common gate common source reference voltage source includes a start circuit, a reference current source circuit and a temperature compensation circuit which are connected between a power supply VDD and a ground in parallel; the starting circuit, the reference current source circuit and the temperature compensation circuit are successively connected; an output end of the start circuit is connected to the reference current source circuit, and the start circuit is used for providing start current in power-on of the power supply and allowing a reference voltage source to break away from a degeneration bias point; an output end of the reference current source circuit is connected to the temperature compensation circuit, a common source common gate current mirror is used to improve the power supply voltage rejection ratio and the voltage regulation factor, and the reference current source circuit is used for generating the reference current; and the temperature compensation circuit is used for generating low temperature drift reference voltage, the common source common gate current mirror is used to duplicate current from the reference current source circuit, and the output voltage of the temperature compensation circuit is the output voltage Vref of the reference voltage source. The full common gate common source reference voltage source is an ultra-low power consumption full cascode reference voltage source, and can suppress power source noise well.