A pump noise cancellation method using empirical mode decomposition and a particle swarm optimisation algorithm, the method being based on the assumption that the pump noise is a linear combination of a set of bases; after extraction of pump noise samples, using empirical mode decomposition to decompose the extracted pump noise samples into a set of signals acting as bases; by means of a particle swarm optimisation algorithm, finding the coefficients of the best linear combination of said set of bases; and updating the pump noise samples to enhance the noise cancellation effect. The present invention corrects current pump noise samples in a weighted manner in a limited number of noise cancellation periods, gradually converging same into a pump noise waveform in a changed unit period in a limited number of iterations, in order to adapt to the slow change of the pump noise during long-term operation of the system.
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