The invention discloses a double stable-voltage power source with a source electrode amplifying processing function for an electrodeless fluorescent lamp. The double stable-voltage power source is characterized in that the double stable-voltage power source is mainly composed of a transformer T1, a triode adjustable stable-voltage circuit, a diode rectifier U, a pulse voltage transformation circuit, a polarity capacitor C1, a stable-voltage diode D1, a source electrode amplifying circuit, a voltage detection circuit, a buffer triggering circuit and a voltage-controlled vibration circuit. The source electrode amplifying circuit is connected with the negative electrode output end of the diode rectifier U, the voltage detection circuit is in series connection between the positive electrode output end of the diode rectifier U and the source electrode amplifying circuit, the buffer triggering circuit is in series connection between the source electrode amplifying circuit and the pulse voltage transformation circuit, and the voltage-controlled vibration circuit is in series connection between the source electrode amplifying circuit and the buffer triggering circuit. According to the double stable-voltage power source, voltage can be modulated into high-frequency pulse width voltage, after a pulse transformer conducts voltage transformation, the output pulse peak value is kept stable,the output voltage is identical to the rated starting voltage of the electrodeless fluorescent lamp, and accordingly it is guaranteed that the power source outputs stable voltage.