Millimeter wave waveguide transmission structure

The invention discloses a millimeter wave waveguide transmission structure, which comprises a first metal layer; the second metal layer is arranged on one side of the first metal layer and attached to the first metal layer, and one side, facing the first metal layer, of the second metal layer is provided with a waveguide transmission groove and waveguide blocking grooves formed in the two sides of the waveguide transmission groove; the waveguide transmission groove and the waveguide blocking groove are arranged along the transmission direction of electromagnetic waves; the waveguide transmission groove and the first metal layer form a waveguide transmission cavity used for transmitting electromagnetic wave signals, and the waveguide blocking groove and the first metal layer form a waveguide blocking cavity used for preventing electromagnetic waves from leaking from a gap between the first metal layer and the second metal layer. By arranging the waveguide blocking cavities on the two sides of the waveguide tra