The invention aims to provide a method and device for reducing acceleration signal measurement noise, wherein a wavelet decomposition technology is mainly used for performing soft threshold noise reduction processing on two paths of acceleration signals respectively, two paths of wavelet reconstructed signals are compared layer by layer, and finally an effective acceleration signal is obtained, sothat the time domain and frequency domain characteristics of the acceleration signals and the relevant information of signal mutation can be reflected at the same time; more importantly, two acceleration sensors are adopted for measurement, the noise of the two acceleration sensors may be different, but the fluctuation characteristics of the effective signals of the two acceleration sensors are basically consistent, extraction can be carried out after wavelet processing so as to obtain a needed signal, if the difference between the two noise reduction signals is large, the problems existing in the acceleration signal noise reduction processing procedure need to be corrected, such as selection of a threshold value; thus, the accuracy of signal noise reduction processing can also be improved.