The invention relates to a spectrum peak position detection method in mass spectrum data processing. The method comprises the following steps of performing CWT (Continuous Wavelet Transform) on an original spectrum diagram, and forming a two-dimensional wavelet coefficient matrix; setting a plurality of particles in the matrix so that the particles move according to a fixed rule and are gradually gathered to a position of a local extreme point; measuring the matrix position, and forming a measuring value matrix by using a noise threshold value and an original spectrum peak intensity modification measuring value; searching ridge points in the measuring value matrix; connecting a ridge line; and determining the spectrum peak position according to the ridge line. The method has the advantages that the original spectrum peak intensity and wavelet coefficient matrix information are integrally used for performing spectrum peak position detection; the problem of false detecting rate raising during the weak peak and overlapping peak detection by a conventional CWT method is solved; and the sensitivity of an algorithm and the resolving capability on the overlapping peaks are improved.