The invention discloses a self-contained recorder comprising a microcontroller, a clock module, a storage battery, a hydrophone sensor, a front-end driving circuit, an AD conversion circuit, a WIFI module and a USB interface module. The clock module is connected with the input terminal of the microcontroller; the input terminal of the front-end driving circuit is connected with the output terminal of the hydrophone sensor and the output terminal is connected with the input terminal of the microcontroller by an AD converter; and the WIFI module and the USB interface module are connected with input and output terminals of the microcontroller. The front-end driving circuit is used for amplifying an analog acoustic signal detected by the hydrophone sensor; the AD conversion circuit is used for converting the analog acoustic signal into a digital acoustic signal; and the main controller is used for processing the digital acoustic signal, storing the processed signal into a storage device by the USB interface module, and sending the digital acoustic signal to a trigger box by the WIFI module. Therefore, the data collection efficiency is increased and synchronization of data collection by all recorders is realized.