The invention relates to a method, a device and magnetic resonance equipment for stabilizing quiescent operating points of radio-frequency amplifiers. The method comprises the following steps: sampling drain current of the radio-frequency amplifier real-timely, calculating a real-time power supply power of the radio-frequency amplifier according to real-timely sampled drain-source electrode voltage of the drain current and the radio-frequency amplifier, calculating the heat dissipation power of the radio-frequency amplifier according to effective power of the radio-frequency amplifier and the calculated real-time power supply power, confirming compensation bias voltage used for eliminating the quiescent operating point drifting due to junction temperature rising of the radio-frequency amplifier according to the heat dissipation power and equivalent thermal resistance of the radio-frequency amplifier, exerting the compensation bias voltage and original bias voltage to a grid-source electrode of the radio-frequency amplifier together, and enabling the quiescent operating points of the radio-frequency amplifier to be kept stable. Through the invention, the stability of the quiescent operating points of RF (Radio Frequency) amplifiers in MR (Magnetic Resonance) equipment can be kept.