The invention discloses a compressor power supply control method and system. The method comprises the steps: controlling the connection between an energy storage capacitor and A compressor to be switched on under the condition that the commercial power stops supplying power, and the energy storage capacitor supplying power to start the compressor; judging whether the compressor is started or not;and when the compressor is started, controlling the connection between a storage battery and the compressor to be conducted, and the storage battery supplying power to the compressor. According to thescheme, when the compressor is started, the capacitor is used for supplying energy, the storage battery is used for supplying power to the compressor after starting, and therefore the storage batteryis prevented from providing large current when the compressor is started, and the service life of the storage battery is prolonged.