A numerical model of foundation scour was established using FLOW-3D software to understand the scouring characteristics of suction bucket jacket foundation. The model simulated the scour depth under different conditions of water depth, flow velocity, and angle of approach. Based on the simulation results, the following conclusions were drawn: (1) the wake of the front bucket has a weakening effect on the scour depth of the rear bucket, which can reduce the scour depth by 35% to 50%. When the flow angle is 60°, the scour depth of the rear bucket is minimum; (2) The overall scour is less affected by water depth, and the scour conditions are similar under different water depths; (3) The flow velocity is one of the main factors affecting the scour depth. With the increase of the flow velocity, the scour depth also increases, and the overall relationship is linear. To comprehensively evaluate the scour situation of suction bucket jacket foundation and to provide basis for further scour protection.