The invention discloses a method and a device for enhancing voice signals. The method comprises: obtaining the prior signal-to-noise ratio (SNR) and the posterior SNR of each voice signal in multiplevoice signals; according to model parameters of the statistic models of the multiple voice signals, obtaining signals parameters of the multiple voice signals; according to the signals parameters as well as the prior SNR and the posterior SNR of each voice signal, obtaining a weighting coefficient of each voice signal which is jointly modeled; using the weighting coefficient of each voice signal to perform weighting to each of the multiple voice signals, so as to obtain weighted multiple voice signals; and combining the weighted multiple voice signals to obtain enhanced voice signals. The technical scheme of the embodiment of the invention fully utilizes relevance among the multiple signals to enhance the SNR of the weighted output signals.