Erosion in seawater pipeline caused by ice particles is one of the major concerns in the field of polar shipbuilding. The Eulerian-Lagrangian approach, dynamic grid technology, and erosion model are employed for simulating the erosion in vibrating pipeline. In this study, the vibration amplitudes of 1 mm and 2 mm and the vibration frequencies of 10 Hz, 20 Hz, 40 Hz, and 80 Hz are chosen. The ... [Show full abstract] results show that the vibration has a great impact on the erosion of seawater pipeline. Without vibration, the most serious erosion appears in the top of the pipe bend. With vibration of 2 mm and 80 Hz, the most serious erosion distributes as lines in the inlet and outlet straight sections. The maximum erosion rate of the pipe wall increases from 1.87×10-6 kg/(m2•s) without vibration to 3.20×10-5 kg/(m2•s) with vibration of 2 mm and 80 Hz, which almost increases by 17 times. The predicted service life of seawater pipeline reduces from 218.6 days without vibration to 12.8 days with vibration of 2 mm and 80 Hz. This study will provide references for the structural optimization design and erosion prevention of seawater pipeline of polar ship.