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This invention relates to the field of audio processing technology and provides a method and system for individualized noise reduction in Bluetooth headsets. The method includes: acquiring raw time-domain noise signals from outside the headset via an external microphone and error signals from inside the headset via an internal microphone; performing frame-by-frame preprocessing on the raw time-domain noise signals to obtain continuous signal frames; decomposing each signal frame into noise components and their time-domain signals with different time-frequency characteristics; generating corresponding anti-noise signals based on multiple noise components and the error signals; calculating the mixing weights corresponding to each noise component based on the error signals and the time-domain signals; and weighting and synthesizing the anti-noise signals corresponding to multiple noise components into an inverted acoustic wave signal. Through refined processing of external and internal noise signals, the effectiveness and adaptability of noise reduction technology can be significantly improved.