With the concept of Intelligent Manufacturing 2025, the shipbuilding industry, as one of the important manufacturing industries in China, needs to address the issue of intelligent and digital transformation. Ship piping system is distributed in various parts of the ship, the number is huge, the spacing is small, and contained in a variety of hull structure, not only is it not easy to find its abnormality, and the alarm cannot determine the location of the fault, which affects the operation and safety of the ship, so there is an urgent need for a visualisation of a new method for monitoring and management. This paper proposes an intelligent monitoring method of pipe system based on three-dimensional digital twin, studies the key technology and architecture of digital twin implementation in the field of ships, and proposes an effective monitoring method. By constructing an equal-scale digital pipe system model of the ship, real-time display of the physical information spatial data of the pipeline and the output data of the pipe line digital twin, and real-time monitoring and abnormal alarm of the ship’s pipe line based on the digital twin, dynamically displaying the abnormal location, thus improving the safety of the ship.