The invention provides a power reference generation circuit with great stability. The power reference generation circuit comprises a DAC unit and a switch control unit, wherein the DAC unit is connected with a power adjusting unit; the power adjusting unit is connected with an ALC power stable amplitude unit; the ALC power stable amplitude unit is connected with a self-oscillation starting unit; the self-oscillation starting unit is connected with a port standing wave matching unit; and the switch control unit is respectively connected with the ALC power stable amplitude unit and the self-oscillation starting unit. In the ALC power stable amplitude unit and the self-oscillation starting unit, with a variode self-oscillation starting unit, effects of temperature to the power is compensatedby a two-group-of-diode complementary way; the circuit is simple; continuous signals with fixed frequency of 50MHz and fixed power of 1.000mW are output; and the power reference generation circuit hasgreat power accuracy and small output port standing-wave ratio.