The invention discloses a strong interference suppression method and system for an automobile frequency modulated continuous wave radar. The method comprises the following steps: determining a bandwidth and a total number of subbands of a radar transmitted signal, controlling the central frequency of a unit generated random subband frequency spectrum according to the radar signal, and determining a time-frequency relation of the random subband frequency spectrum; generating control voltage of a voltage-controlled oscillator according to the time-frequency relation of the random subband frequency spectrum, so as to control the voltage-controlled oscillator to emit a random subband signal; and performing frequency mixing de-sloping treatment on a strong interference signal in a receiving channel according to the random subband signal to enable a strong interference baseband signal to fall into stop band of a low pass filter. The invention further discloses a strong interference suppression system for implementing the method. By the use of the strong interference suppression method and the strong interference suppression system for strong interference suppression for the automobile frequency modulated continuous wave radar, the strong interference signal of the radar can be accurately, stably and effectively suppressed, and the target distance measurement and speed measurement reliability of the automobile frequency modulated continuous wave radar is improved.