The invention discloses a high-frequency switch driving power supply and an over-temperature protection method, and relates to the field of driving power supplies. The high-frequency switch driving power supply comprises a driving chip and a temperature sensor, the temperature sensor is arranged on a substrate with the driving chip, and connected with the driving chip, and when the temperature detected by the temperature sensor is higher than a threshold, the driving chip can reduce the input power of the high-frequency switch driving power supply. Via the provided over-temperature protectionmethod, the working temperature of the high-frequency switch driving power supply can be monitored, over-temperature protection can be realized more accurately, and the service life of devices can beprolonged.