In order to solve the problem that the assumption of the straight shaft is inconsistent with the actual situation of marine water-lubricated journal bearings, the journal bending curve was identified by calculating the three-dimensional mechanical model of propulsion shafting. A fluid-solid coupling model of water-lubricated journal bearing considering journal bending was proposed. The results show that the simulation values matched the experiment values well at partial sections by a full-circumference film pressure distribution experiment of the full-size bearing. The Journal bending line caused the water film pressure peak at both ends of the bearing and cause the lubrication performance distribution to gather to one side. As eccentricity increases and Young’s modulus of lining decreases, the aggregation phenomenon is aggravated, maximum film pressure and carrying capacity increase, while minimum film thickness and friction coefficient decrease.