Abstract: The present disclosure provides a revolving speed variable voltage power supply for a glow plug of a two-stroke or four-stroke gasoline engine, including: an adjust device configured for outputting different control commands according to different revolving speeds of the two-stroke or four-stroke gasoline engine; a switch device connected to the adjust device, and configured for controlling an ON/OFF of a circuit according to the different control commands; a rectify device connected to the adjust device and the switch device, and configured to provide different voltages to the glow plug according to the different control commands and/or the ON/OFF of the switch device. According to the present disclosure, the effects of automatic control of voltage, ignition temperature, etc. can be achieved, the power consumption of the battery carried by the model can be effectively reduced, and the battery life and use stability can be increased.