Regarding the problem that it is difficult to monitor the water-destruction of submerged spur dike in real time，this paper introduces acoustic camera to monitor the shape of submerged spur dike in real time. Based on the mapping principle of acoustic camera，a method is proposed to establish multi-view height arc using multi-view acoustic image and to determine the three-dimensional information of external structural feature points of submerged spur dike according to the constraint relationship between views. Combined with this method，the three-dimensional information reconstruction experiment of the shape feature points of the indoor submerged spur dike model is carried out. The results show that the external dimension error of the submerged super dike model reconstructed based on the acoustic image of four viewpoints is in the range of 0.8%~8.6%. It is feasible to apply the equipment and method to the real-time monitoring of submerged spur dike shape damage，which can provide a feasible reference and idea for the waterway department to maintain the regulation buildings.