A shipborne communication monitoring system disclosed by the present invention comprises a voice signal transmitting terminal, the voice signal transmitting terminal is connected with a marine communication base station through a wireless signal, the voice signal transmitting terminal is also electrically connected with a recording module, the recording module is electrically connected with a recording file transmission module, and the recording module is used for recording voice information of the voice signal transmitting terminal. The recording file transmission module is used for sending recorded voice information to the recording file receiving end through the marine communication base station, the server and the wired network, and the recording file receiving end and the voice signal receiving end are both in telecommunication connection with the voice tester. According to the invention, the voice of the voice signal transmitting end can be recorded and sent to the recording file receiving end, the voice quality can be detected more accurately by comparing real-time voice with voice recording, detection can be carried out through a PESQ system and manual reinspection, the detection modes are diversified, and the detection result is more accurate; and a delay calculation module for calculating communication delay is also arranged, so that the delay of a communication signal can be monitored.