Preparation method of axial corrugated horn antenna with complex cavity

The invention discloses a preparation method of an axial corrugated horn antenna with a complex cavity. The axial corrugated horn antenna comprises a 90-degree corrugated horn antenna and a shell. Wherein the 90-degree corrugated horn antenna comprises an antenna waveguide section and a corrugated groove; the shell comprises a left shell body and a right shell body, cavity structures are machined on the left shell body and the right shell body respectively, and the left shell body and the right shell body are assembled and connected to form a cavity penetrating through the interior of the shell body. And assembling and connecting the 90-degree corrugated horn antenna and the shell, and relatively communicating the cavity with the waveguide section to form the axial corrugated horn antenna. The method has the advantages that the high-quality requirements of surface smoothness and machining precision are met; the adopted process method is mature in technology and high in operability; a welding type integrated s