A first capacitor 218 and a fifth resistor 217 are sequentially connected to the base of the transistor 211 of the current detection feedback circuit provided by the present embodiment to form the power detection feedback circuit. The fifth resistor 217 and the first capacitor 218 are connected in series (the fifth resistor 217 and the first capacitor 218 are connected in series to form a second detection circuit) between the collector of the transistor 201 of the first stage of amplifier circuit and the base of the transistor 211. The output power of the first stage of amplifier circuit is detected through the fifth resistor 217 and the first capacitor 218, and the intensity of the power leaked into the transistor 211 can be controlled. When the radio frequency power amplifier has input power, the output power of the transistor 201 of the first stage of amplifier circuit will be leaked to the base of the transistor 211 by means of the fifth resistor 217 and the first capacitor 218. Therefore, when the output power of the first stage of amplifier circuit increases, the power leaked to the transistor 211 by means of the fifth resistor 217 and the first capacitor 218 also correspondingly increases, so that the operating current of the transistor 211 also correspondingly increases. At the moment, the control voltage on the resistor 213 connected to the collector of the transistor 211 can also increase. The voltage of the base of the transistor 215 decreases through the resistor 214, so that the current flowing through the transistor 215 is controlled to correspondingly decrease. Current output from the transistor 215 is input into the base of the transistor 201 of the first stage of amplifier circuit through the resistor 216, thereby decreasing the quiescent operating current of the transistor 201 of the first stage of amplifier circuit, so that the gain of the first stage of amplifier circuit derceases, and the output power of the first stage of amplifier circuit decreases.