The large amphibious aircraft is typical of the hull type configuration, and its landing area can be simplified as a three-dimensional wedge. Because the amphibious aircraft has the necessary characteristics of taking off and landing on water, the impact characteristics of the three-dimensional wedge in the process of wave landing are studied, which provides guidance for the design and selection of the bottom of the amphibious aircraft. The theoretical wave height of wave is obtained by theoretical calculation, and the effectiveness of wave simulation in CFD is verified by comparison. Meanwhile, the influence of different bottom oblique angles and different wavelengths on the impact load of water wedge is studied. The calculation results show that the impact load of the wedge increases with the increase of the wavelength, and the water load will be saturated due to the limitation of the infiltration area. The increase of the oblique angle of the bottom of the ship makes the water load of the collision wave gradually decrease. It is suggested that the oblique angle of the bottom of the ship should be appropriately increased to reduce the collision load.