Abstract: The local scouring of marine piles under the action of wave currents seriously threatens their structural stability and safety. In order to improve the service life of marine piles and reduce the maintenance cost, a new type of radial plate device is designed based on the principle of butyl dam shore protection for the protection of scouring of marine piles and Flow-3D numerical simulation is used to investigate the effect and mechanism of radial plate device of two different configurations, namely, curved and straight, under the action of wave currents on the protection of local scouring of pile foundations. The results show that the new radial plate device is effective in protecting the pile foundation from localized scour under the combined effect of wave current. The results show that the new radiation plate device can effectively protect the pile foundation from local scour, and compared with the unprotected condition, the radiation plate device does not produce obvious scour in the radial range of the pile perimeter, and siltation occurs in some areas, and the protection effect of the curved radiation plate is better than that of the linear shape. Radiation plate device has a good effect of water blocking, picking flow and deceleration of silt, water impact radiation plate after the reduction of flow velocity, flow direction change, the formation of water stagnation area within the radial range of the pile perimeter, stagnation area within the flow velocity is much smaller than the flow velocity outside the stagnation area, resulting in the sediment carried by the water in the pile perimeter as well as the radiation plate around the deposition of the scouring protection effect.