The subject of the invention is a user voice verification method, in which in the presence of the user an acoustic marker signal is played, a voice signal from the user marked by an acoustic marker signal is recorded, characterised in that an acoustic marker signal is separated from the registered signal, a check is performed whether the registered signal features the acoustic marker signal expected for a given session, and then the acoustic marker signal is verified, by checking whether the recorded signal features an acoustic marker signal unexpected for a given session or whether there is a trace of acoustic marker signal being removed from or modified in the registered signal, as well as the fact that an alarm signal is generated, if there is no acoustic marker signal in the signal for the particular session or the acoustic merker signal verification result is positive.
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