The invention discloses a method and device for separating and extracting multiple signals, and relates to a method and device for direction finding, digital beam forming, signal separation, automatic identification and continuous demodulation of multiple signals in the field of communication reconnaissance. It consists of antenna array, antenna switch array, nine-channel receiver, post-processing module, multi-signal separation and demodulation module, power supply and other components. It uses the spatial spectrum estimation and direction-finding technology based on array signal processing to obtain the direction of arrival of electromagnetic signals, calculates weighted vectors and sets hardware devices through digital beamforming and blind beamforming methods, so as to detect multiple signals of the same frequency or different frequencies arriving at the same time. The signal is filtered in the spatial domain, and the separated multi-channel signals are automatically identified and continuously demodulated and output. It has the characteristics of high interference suppression, fast processing speed, low cost, convenient operation and maintenance, etc. It is especially suitable for multi-signal separation and extraction devices in communication countermeasures, intelligence reconnaissance, radio monitoring and other occasions.