The invention relates to a method for realizing wireless microphone receiver diversity by utilizing noise and diversity system. The method includes that a receiving unit circuit processes a radio frequency signal and then outputs a demodulating signal to a single-pole double-throw switch, the receiving unit circuit also outputs a field intensity signal, and the field intensity signal is input to the two ends of a field intensity comparer by virtue of a low pass filter; a high pass filter filters low frequency component from the demodulating signal and remains high frequency noise component, adirect current voltage in direct proportion with the intensity and amplitude of the high frequency noise component is output by virtue of a noise detector, the direct current voltage controls the opening and close of a single-pole single-throw switch, when the intensity of one radio frequency signal rapidly falls and the direct current exceeds the preset threshold value, the single-pole single-throw switch is grounded, and the single-pole double-throw switch is switched to another demodulating signal. The invention can eliminate action lag caused by field intensity diversity circuit and burstnoise produced in rapid falling of radio frequency signal intensity.