To separate the overlapping voltammetric peaks that can be described by the sech(2)-function, a new method, flip shift subtraction method (FSSM), is proposed. It is built on the basis of finding the peak positions using the Marr wavelet through the continuous wavelet transform (CWT). A corresponding theory, which possesses a general meaning, is presented as a basis of finding the peak positions. To guarantee the accuracy of FSSM, an algorithm, crossed iterative algorithm of continuous wavelet transform and original signal (CIACWTOS), is built on to locate the refined peak positions. Meanwhile, the theoretical errors on peak areas caused by FSSM are discussed.