The invention discloses a marine seismic cable and a working section thereof. The working section, used for collecting and transmitting seismic data, comprises at least a hydrophone and at least a data collection unit; each hydrophone is used for collecting artificially reflected seismic signals and converting the signals to electric signals; each data collection unit is used for further converting the artificially reflected seismic signals after being converted to electric signals to digital signals and sending the digital signals to data transmission units. Each data transmission unit corresponds to one working section and is located at the front end of the working section; and as the number of working sections of the cable is determined based on the burying depth of a detecting target and multiple data transmission units and corresponding working sections thereof can be set, the seismic data transmitted by the marine seismic cable are efficiently guaranteed to have better stabilityand farther transmission distance and good detection information can be obtained.