The invention discloses a digital acquisition device, which is applied to an underwater acoustic towed array. The digital acquisition device comprises multiple data acquisition and processing mechanisms, multiple hydrophone channels and multiple hydrophones, wherein each hydrophone is used for converting underwater acoustic signals to underwater acoustic analog signals; each hydrophone channel isused for accommodating the hydrophone and receiving the underwater acoustic analog signals sent by each hydrophone; the data acquisition and processing mechanisms are connected with the multiple hydrophone channels for conditioning and converting the multiple underwater acoustic analog signals sent by the hydrophones to acquire multiple channels of underwater acoustic digital signals and packagingthe multiple channels of underwater acoustic digital signals. Through arranging the data acquisition and processing mechanisms to digitize the acquired underwater acoustic analog signals, the analogsignal transmission distance is reduced, and the transmission loss and the transmission channel noise interference are reduced maximally.