The invention relates to a noise reduction method for partial discharge pulse measurement. The noise reduction method comprises the following steps of 1) dividing the field measurement data into signals and noise frames through a threshold value method; 2) correcting the noise frame data; 3) acquiring the FFT coefficient of the corrected noise frame, and performing the rotary transformation on theFFT coefficient; 4) selecting the three points near the peak point of the frequency spectrum of the noise frame and acquiring the corresponding FFT conversion coefficient, and obtaining the estimatedvalue of the narrow-band interference angle frequency through simultaneous solution; 5) reconstructing the narrow-band interference of the noise frame and eliminating the narrow-band interference toobtain the background signal including only white noise from; 6) calculating the maximum likelihood estimation value of the white noise variance; 7 ) further reconstructing and eliminating the narrow-band interference in the signal frame to obtain a signal which only comprises a pulse signal and a white noise; 8 ) and calculating the pulse energy in the signal frame. Compared with the prior art, the method has the advantages that the detection influence is reduced, and the reliability of detection is improved.