The invention provides a "V"-shaped radar radome structure and a preparation method thereof. The radome structure is obtained by co-curing of an antenna, a skin and a filling core layer, the skin andthe filling core layer are adhered by using an adhesive layer so as to form the radome, and the antenna and the filling core layer are adhered by using the adhesive layer and wrapped in the radome. The influence of multilayer reflection interference of the conventional interlayer radome surface can be weakened by the integral design of the radome and the antenna. Besides, compared with the multilayer skin core layer structure, only one skin is required, the wave permeability can be enhanced by the ultrathin skin design and the error of aiming can be greatly reduced. Meanwhile, the antenna pattern and phase consistency can be enhanced, and the problems of reduction of the wave permeability and pattern distortion under the broadband condition of the "V"-shaped radome can be solved, and the wave permeability, the pattern and the phase consistency of the "V"-shaped radome are enabled to meet the working requirements of the radar antenna.