A side-scan type ship draught detection system comprises a plurality of transmitting end ultrasonic sensors which are longitudinally installed and distributed along a transmitting end monitoring support, and the transmitting end ultrasonic sensors form a transmitting end ultrasonic sensor array; a plurality of receiving end ultrasonic sensors are longitudinally installed and distributed along thereceiving end monitoring support, and the plurality of receiving end ultrasonic sensors form a receiving end ultrasonic sensor array; a receiving end ultrasonic probe is mounted above the transmittingend ultrasonic sensor array of the transmitting end monitoring bracket; and a transmitting end ultrasonic probe is mounted above the receiving end ultrasonic sensor array of the receiving end monitoring bracket. And the transmitting end ultrasonic sensor array, the receiving end ultrasonic sensor array, the receiving end ultrasonic probe and the transmitting end ultrasonic probe are all connectedwith the control module. According to the utility model, the ultrasonic ship detection probe is adopted to detect whether a ship exists or not, then an enable signal of the ultrasonic sensor array iscontrolled by judging a ship signal, and then data acquisition, processing and display are carried out, so that the transmitting end sensor array is in a closed state when no ship passes, and the service life of the system is prolonged.