The invention discloses a milling machining method for a wave-transmitting ceramic antenna window and aims to solve the problems that existing wave-transmitting ceramic antenna windows are low in milling machining efficiency, high in rejection rate and poor in machining quality. The method is technically characterized by comprising the steps as follows: 1, the contact relationship between a cutting edge of a tool and the surface of a workpiece is obtained; the stress field intensity of the tip of the cutting edge of the tool is solved, the critical milling depth is obtained, and then machining process parameters of the workpiece are determined according to the critical milling depth; 2, the machining path of tool follows the principle that different tool path plans are adopted for different machining areas on the same plane, and the shearing stress on the machining edge points to the inside of a material; 3, the two-end feeding process is adopted for through holes, that is, the front surface and the back surface of the same through hole are machined sequentially, and the tool stop positions are kept inside the through holes. With the method, the machined surface of the wave-transmitting ceramic antenna window can be free of damage such as pits, microscopic cracks, edge damage, hole edge breakage and the like, and the working requirements of the wave-transmitting ceramic antenna window can be met.