Layered casting and milling integrated manufacturing method for terahertz conical corrugated horn

The invention discloses a layered casting and milling integrated manufacturing method for a terahertz conical corrugated horn. The method comprises the following steps: spraying and electroforming a first conical corrugated horn layer; spraying and electroforming a second conical corrugated horn layer; repeatedly spraying and electroforming the corrugated horn layer to obtain a certain number of layers of solid corrugated horns; separating the solid corrugated horn from the metal flat plate; the sacrificial core mold in the solid corrugated horn is dissolved through an etching solution, and a hollow corrugated horn is obtained; and cutting and trimming the corrugated protection layer on the outer side of the hollow corrugated horn according to the size requirement to obtain the terahertz conical corrugated horn. The jet electroforming machining technology and the tube electrode milling machining technology are utilized, the limit of traditional machining is broken through, the electroforming layer is controll