Novel foamed aluminum waveguide cut-off window

The utility model provides a novel foamed aluminum waveguide cut-off window, and belongs to the technical field of waveguide cut-off windows. The device comprises an inner window frame, a foamed aluminum functional part, an outer buckling window frame and a conductive lining, the inner window frame is of a square frame structure, a concentric-square-shaped baffle is arranged on the periphery of an opening of the front side of the inner window frame, a circle of fixed wing plates are arranged on the left side face, the right side face, the upper side face and the lower side face of the inner window frame, and a plurality of bolt holes are formed in the fixed wing plates; the outer buckling window frame is of a square-frame-shaped structure and is detachably arranged on the rear side of the inner window in a matched mode, a concentric-square-shaped baffle is arranged on the periphery of an edge opening of the rear side of the outer buckling window frame, and the conductive lining is arranged at the contact posi